diff --git a/app/Http/Controllers/CalendarController.php b/app/Http/Controllers/CalendarController.php
index c176692..dc99977 100644
--- a/app/Http/Controllers/CalendarController.php
+++ b/app/Http/Controllers/CalendarController.php
@@ -52,6 +52,7 @@ class CalendarController extends Controller
         $defaultView    = $user->getSetting('calendar.last_view', 'month');
         $defaultDate    = $user->getSetting('calendar.last_date', Carbon::today($tz)->toDateString());
         $defaultDensity = (int) $user->getSetting('calendar.last_density', 30);
+        $defaultBusinessHours = (int) $user->getSetting('calendar.business_hours', 0);
 
         // week start preference
         $weekStartPref = $user->getSetting('calendar.week_start', 'sunday'); // 'sunday'|'monday'
@@ -76,6 +77,16 @@ class CalendarController extends Controller
             60 => 4,
         };
 
+        // business hours toggle
+        $businessHoursEnabled = (int) $request->query('business_hours', $defaultBusinessHours) === 1;
+        $businessHoursRange = [
+            'start' => 8,
+            'end'   => 18,
+        ];
+        $businessHoursRows = $businessHoursEnabled
+            ? intdiv((($businessHoursRange['end'] - $businessHoursRange['start']) * 60), 15)
+            : 96;
+
         // date range span and controls
         $span = $this->gridSpan($view, $range, $weekStart, $weekEnd);
         $nav  = $this->navDates($view, $range['start'], $tz);
@@ -92,6 +103,9 @@ class CalendarController extends Controller
             $user->setSetting('calendar.last_date', $range['start']->toDateString());
             $user->setSetting('calendar.last_density', (string) $stepMinutes);
         }
+        if ($request->has('business_hours')) {
+            $user->setSetting('calendar.business_hours', $businessHoursEnabled ? '1' : '0');
+        }
 
         /**
          *
@@ -121,6 +135,10 @@ class CalendarController extends Controller
             $span['end']
         );
 
+        $businessHoursForView = ($businessHoursEnabled && in_array($view, ['day', 'week', 'four'], true))
+            ? $businessHoursRange
+            : null;
+
         $events = $this->buildEventPayloads(
             $events,
             $calendar_map,
@@ -130,6 +148,7 @@ class CalendarController extends Controller
             $tz,
             $recurrence,
             $span,
+            $businessHoursForView,
         );
 
         /**
@@ -175,6 +194,7 @@ class CalendarController extends Controller
             $tz,
             $recurrence,
             ['start' => $mini_grid_start, 'end' => $mini_grid_end],
+            null,
         );
 
         // now build the mini from mini_events (not from $events)
@@ -231,6 +251,12 @@ class CalendarController extends Controller
             'mini'         => $mini,      // mini calendar days with events for indicators
             'mini_nav'     => $mini_nav,  // separate mini calendar navigation
             'mini_headers' => $mini_headers,
+            'business_hours' => [
+                'enabled' => $businessHoursEnabled,
+                'start'   => $businessHoursRange['start'],
+                'end'     => $businessHoursRange['end'],
+                'rows'    => $businessHoursRows,
+            ],
         ];
 
         // time-based payload values
@@ -238,11 +264,23 @@ class CalendarController extends Controller
         if ($timeBased)
         {
             // create the time gutter if we're in a time-based view
-            $payload['slots'] = $this->timeSlots($range['start'], $tz, $timeFormat);
+            $payload['slots'] = $this->timeSlots(
+                $range['start'],
+                $tz,
+                $timeFormat,
+                $businessHoursEnabled ? $businessHoursRange : null
+            );
             $payload['time_format'] = $timeFormat; // optional, if the blade cares
 
             // add the now indicator
-            $payload['now'] = $this->nowIndicator($view, $range, $tz, 15);
+            $payload['now'] = $this->nowIndicator(
+                $view,
+                $range,
+                $tz,
+                15,
+                1,
+                $businessHoursEnabled ? $businessHoursRange : null
+            );
         }
 
         // send the density array always, even though it doesn't matter for month
@@ -570,15 +608,23 @@ class CalendarController extends Controller
      *
      * Create the time gutter for time-based views
      */
-    private function timeSlots(Carbon $dayStart, string $tz, string $timeFormat): array
+    private function timeSlots(Carbon $dayStart, string $tz, string $timeFormat, ?array $businessHours = null): array
     {
         $minutesPerSlot = 15;
-        $slotsPerDay = intdiv(24 * 60, $minutesPerSlot); // 96
+        $startMinutes = 0;
+        $endMinutes = 24 * 60;
+
+        if (is_array($businessHours)) {
+            $startMinutes = (int) $businessHours['start'] * 60;
+            $endMinutes = (int) $businessHours['end'] * 60;
+        }
+
+        $slotsPerDay = intdiv(max(0, $endMinutes - $startMinutes), $minutesPerSlot);
 
         $format = $timeFormat === '24' ? 'H:i' : 'g:i a';
 
         $slots = [];
-        $t = $dayStart->copy()->tz($tz)->startOfDay();
+        $t = $dayStart->copy()->tz($tz)->startOfDay()->addMinutes($startMinutes);
 
         for ($i = 0; $i < $slotsPerDay; $i++) {
             $slots[] = [
@@ -586,7 +632,7 @@ class CalendarController extends Controller
                 'label'    => $t->format($format),
                 'key'      => $t->format('H:i'),   // stable "machine" value
                 'index'    => $i,                  // 0..95
-                'minutes'  => $i * $minutesPerSlot,
+                'minutes'  => $startMinutes + ($i * $minutesPerSlot),
                 'duration' => $minutesPerSlot,     // handy for styling math
             ];
 
@@ -613,7 +659,8 @@ class CalendarController extends Controller
         ?Carbon $endLocal,
         Carbon $rangeStart,
         string $view,
-        int $minutesPerSlot = 15
+        int $minutesPerSlot = 15,
+        int $gridStartMinutes = 0
     ): array
     {
         $start = $startLocal->copy();
@@ -626,7 +673,8 @@ class CalendarController extends Controller
         $displayMinutes = $durationMinutes > 0 ? $durationMinutes : $minutesPerSlot;
 
          // row placement (96 rows when minutesPerSlot=15)
-        $startMinutesFromMidnight = ($start->hour * 60) + $start->minute;
+        $startMinutesFromMidnight = (($start->hour * 60) + $start->minute) - $gridStartMinutes;
+        $startMinutesFromMidnight = max(0, $startMinutesFromMidnight);
         $startRow = intdiv($startMinutesFromMidnight, $minutesPerSlot) + 1;
 
         $rowSpan = max(1, (int) ceil($displayMinutes / $minutesPerSlot));
@@ -665,11 +713,14 @@ class CalendarController extends Controller
         array $range,
         string $tz,
         EventRecurrence $recurrence,
-        array $span
+        array $span,
+        ?array $businessHours = null
     ): Collection {
         $uiFormat = $timeFormat === '24' ? 'H:i' : 'g:ia';
         $spanStartUtc = $span['start']->copy()->utc();
         $spanEndUtc = $span['end']->copy()->utc();
+        $gridStartMinutes = $businessHours ? ((int) $businessHours['start'] * 60) : 0;
+        $gridEndMinutes = $businessHours ? ((int) $businessHours['end'] * 60) : (24 * 60);
 
         return $events->flatMap(function ($e) use (
             $calendarMap,
@@ -679,7 +730,10 @@ class CalendarController extends Controller
             $tz,
             $recurrence,
             $spanStartUtc,
-            $spanEndUtc
+            $spanEndUtc,
+            $gridStartMinutes,
+            $gridEndMinutes,
+            $businessHours
         ) {
             $cal = $calendarMap[$e->calendarid];
             $timezone = $cal->timezone ?? config('app.timezone');
@@ -723,7 +777,10 @@ class CalendarController extends Controller
                 $tz,
                 $timezone,
                 $color,
-                $colorFg
+                $colorFg,
+                $gridStartMinutes,
+                $gridEndMinutes,
+                $businessHours
             ) {
                 $startUtc = $occ['start'];
                 $endUtc = $occ['end'];
@@ -734,12 +791,28 @@ class CalendarController extends Controller
                 $startForGrid = $startUtc->copy()->tz($tz);
                 $endForGrid = $endUtc->copy()->tz($tz);
 
+                if ($businessHours) {
+                    $startMinutes = ($startForGrid->hour * 60) + $startForGrid->minute;
+                    $endMinutes = ($endForGrid->hour * 60) + $endForGrid->minute;
+
+                    if ($endMinutes <= $gridStartMinutes || $startMinutes >= $gridEndMinutes) {
+                        return null;
+                    }
+
+                    $displayStartMinutes = max($startMinutes, $gridStartMinutes);
+                    $displayEndMinutes = min($endMinutes, $gridEndMinutes);
+
+                    $startForGrid = $startForGrid->copy()->startOfDay()->addMinutes($displayStartMinutes);
+                    $endForGrid = $endForGrid->copy()->startOfDay()->addMinutes($displayEndMinutes);
+                }
+
                 $placement = $this->slotPlacement(
                     $startForGrid,
                     $endForGrid,
                     $range['start']->copy()->tz($tz),
                     $view,
-                    15
+                    15,
+                    $gridStartMinutes
                 );
 
                 $occurrenceId = $occ['recurrence_id']
@@ -770,7 +843,7 @@ class CalendarController extends Controller
                     'start_col'       => $placement['start_col'],
                     'duration'        => $placement['duration'],
                 ];
-            });
+            })->filter()->values();
         })->keyBy('occurrence_id');
     }
 
@@ -967,7 +1040,14 @@ class CalendarController extends Controller
      *    'col_end' => int,    // grid column end
      *  ]
      */
-    private function nowIndicator(string $view, array $range, string $tz, int $minutesPerSlot = 15, int $gutterCols = 1): array
+    private function nowIndicator(
+        string $view,
+        array $range,
+        string $tz,
+        int $minutesPerSlot = 15,
+        int $gutterCols = 1,
+        ?array $businessHours = null
+    ): array
     {
         // only meaningful for time-based views
         if (!in_array($view, ['day', 'week', 'four'], true)) {
@@ -986,8 +1066,15 @@ class CalendarController extends Controller
 
         // row: minutes since midnight, snapped down to slot size
         $minutes = ($now->hour * 60) + $now->minute;
-        $snapped = intdiv($minutes, $minutesPerSlot) * $minutesPerSlot;
-        $row = intdiv($snapped, $minutesPerSlot) + 1; // 1-based
+        $gridStartMinutes = $businessHours ? ((int) $businessHours['start'] * 60) : 0;
+        $gridEndMinutes = $businessHours ? ((int) $businessHours['end'] * 60) : (24 * 60);
+
+        if ($businessHours && ($minutes < $gridStartMinutes || $minutes > $gridEndMinutes)) {
+            return ['show' => false, 'row' => 1, 'day_col' => 1, 'col_start' => 1, 'col_end' => 2];
+        }
+
+        $snapped = intdiv($minutes - $gridStartMinutes, $minutesPerSlot) * $minutesPerSlot;
+        $row = intdiv(max(0, $snapped), $minutesPerSlot) + 1; // 1-based
 
         // column: 1..N where 1 is the first day column in the events grid
         if ($view === 'day') {
diff --git a/resources/css/lib/calendar.css b/resources/css/lib/calendar.css
index 952d63b..b69878f 100644
--- a/resources/css/lib/calendar.css
+++ b/resources/css/lib/calendar.css
@@ -131,7 +131,7 @@
     /* time column */
     ol.time {
         @apply grid z-0 pt-4;
-        grid-template-rows: repeat(96, var(--row-height));
+        grid-template-rows: repeat(var(--grid-rows, 96), var(--row-height));
 
         time {
             @apply relative flex items-center justify-end items-start pr-4;
@@ -150,7 +150,7 @@
     /* event positioning */
     ol.events {
         @apply grid py-4;
-        grid-template-rows: repeat(96, var(--row-height));
+        grid-template-rows: repeat(var(--grid-rows, 96), var(--row-height));
         --event-col: 0;
         --event-row: 0;
         --event-end: 4;
@@ -381,4 +381,3 @@
         transform: translateX(0);
     }
 }
-
diff --git a/resources/views/calendar/index.blade.php b/resources/views/calendar/index.blade.php
index 547c7ac..fde170c 100644
--- a/resources/views/calendar/index.blade.php
+++ b/resources/views/calendar/index.blade.php
@@ -74,6 +74,7 @@
             :view="$view"
             :density="$density"
             :headers="$mini_headers"
+            :business_hours="$business_hours"
             class="aside-inset"
         />
     </x-slot>
@@ -105,6 +106,7 @@
                     {{-- persist values from other forms --}}
                     <input type="hidden" name="view" value="{{ $view }}">
                     <input type="hidden" name="density" value="{{ $density['step'] }}">
+                    <input type="hidden" name="business_hours" value="{{ (int) ($business_hours['enabled'] ?? 0) }}">
 
                     <nav class="button-group button-group--primary">
                         <x-button.group-button
@@ -148,6 +150,7 @@
 
                     {{-- persist data from density form --}}
                     <input type="hidden" name="density" value="{{ $density['step'] }}">
+                    <input type="hidden" name="business_hours" value="{{ (int) ($business_hours['enabled'] ?? 0) }}">
                     <x-button.group-input value="day" :active="$view === 'day'">Day</x-button.group-input>
                     <x-button.group-input value="week" :active="$view === 'week'">Week</x-button.group-input>
                     <x-button.group-input value="month" :active="$view === 'month'">Month</x-button.group-input>
@@ -176,6 +179,7 @@
                 :active="$active"
                 :density="$density"
                 :weekstart="$week_start"
+                :business_hours="$business_hours"
                 :now="$now"
             />
             @break
@@ -190,6 +194,7 @@
                 :hgroup="$hgroup"
                 :active="$active"
                 :density="$density"
+                :business_hours="$business_hours"
                 :now="$now"
             />
             @break
@@ -204,6 +209,7 @@
                 :hgroup="$hgroup"
                 :active="$active"
                 :density="$density"
+                :business_hours="$business_hours"
                 :now="$now"
             />
             @break
diff --git a/resources/views/components/calendar/day/day.blade.php b/resources/views/components/calendar/day/day.blade.php
index 266dbc0..43e436f 100644
--- a/resources/views/components/calendar/day/day.blade.php
+++ b/resources/views/components/calendar/day/day.blade.php
@@ -9,11 +9,12 @@
     'active' => [],
     'density' => '30',
     'now' => [],
+    'business_hours' => [],
 ])
 
 <section
     class="calendar {{ $class }}" data-density="{{ $density['step'] }}"
-    style="--now-row: {{ $now['row'] }}; --now-col-start: {{ $now['col_start'] }}; --now-col-end: {{ $now['col_end'] }};"
+    style="--now-row: {{ $now['row'] }}; --now-col-start: {{ $now['col_start'] }}; --now-col-end: {{ $now['col_end'] }}; --grid-rows: {{ $business_hours['rows'] ?? 96 }};"
 >
     <hgroup>
         @foreach ($hgroup as $h)
@@ -39,6 +40,7 @@
         @endif
     </ol>
     <footer>
-        <x-calendar.time.density view="day" :density="$density" />
+        <x-calendar.time.business-hours view="day" :density="$density" :business_hours="$business_hours" />
+        <x-calendar.time.density view="day" :density="$density" :business_hours="$business_hours" />
     </footer>
 </section>
diff --git a/resources/views/components/calendar/four/four.blade.php b/resources/views/components/calendar/four/four.blade.php
index bfcef90..acf4109 100644
--- a/resources/views/components/calendar/four/four.blade.php
+++ b/resources/views/components/calendar/four/four.blade.php
@@ -9,6 +9,7 @@
     'active' => [],
     'density' => '30',
     'now' => [],
+    'business_hours' => [],
 ])
 
 <section
@@ -16,7 +17,8 @@
     style=
        "--now-row: {{ (int) $now['row'] }};
         --now-col-start: {{ (int) $now['col_start'] }};
-        --now-col-end: {{ (int) $now['col_end'] }};"
+        --now-col-end: {{ (int) $now['col_end'] }};
+        --grid-rows: {{ $business_hours['rows'] ?? 96 }};"
 >
     <hgroup>
         @foreach ($hgroup as $h)
@@ -42,6 +44,7 @@
         @endif
     </ol>
     <footer>
-        <x-calendar.time.density view="four" :density="$density" />
+        <x-calendar.time.business-hours view="four" :density="$density" :business_hours="$business_hours" />
+        <x-calendar.time.density view="four" :density="$density" :business_hours="$business_hours" />
     </footer>
 </section>
diff --git a/resources/views/components/calendar/mini/mini.blade.php b/resources/views/components/calendar/mini/mini.blade.php
index 7c8ffa2..b191b15 100644
--- a/resources/views/components/calendar/mini/mini.blade.php
+++ b/resources/views/components/calendar/mini/mini.blade.php
@@ -5,6 +5,7 @@
     'class' => '',
     'density' => [],
     'headers' => [],
+    'business_hours' => [],
 ])
 
 <section id="mini" class="mini mini--month {{ $class }}">
@@ -22,6 +23,7 @@
             {{-- preserve main calendar context for full-reload fallback --}}
             <input type="hidden" name="view" value="{{ $view }}">
             <input type="hidden" name="date" value="{{ request('date') }}">
+            <input type="hidden" name="business_hours" value="{{ (int) ($business_hours['enabled'] ?? 0) }}">
             {{-- nav buttons --}}
             <button type="submit" name="mini" class="button--icon button--sm" value="{{ $nav['prev'] }}" aria-label="Go back 1 month">
                 <x-icon-chevron-left />
@@ -51,6 +53,7 @@
             {{-- stay on the same view (month/week/etc --}}
             <input type="hidden" name="view" value="{{ $view }}">
             <input type="hidden" name="density" value="{{ $density['step'] }}">
+            <input type="hidden" name="business_hours" value="{{ (int) ($business_hours['enabled'] ?? 0) }}">
 
             @foreach ($mini['days'] as $day)
             <button
diff --git a/resources/views/components/calendar/time/business-hours.blade.php b/resources/views/components/calendar/time/business-hours.blade.php
new file mode 100644
index 0000000..8122038
--- /dev/null
+++ b/resources/views/components/calendar/time/business-hours.blade.php
@@ -0,0 +1,34 @@
+@props([
+    'business_hours' => [],
+    'view' => 'day',
+    'density' => [],
+])
+
+@php
+    $enabled = (int) ($business_hours['enabled'] ?? 0) === 1;
+@endphp
+
+<form id="calendar-business-hours"
+      method="get"
+      class="button-group button-group--primary button-group--sm"
+      action="{{ route('calendar.index') }}"
+      hx-get="{{ route('calendar.index') }}"
+      hx-target="#calendar"
+      hx-select="#calendar"
+      hx-swap="outerHTML"
+      hx-push-url="true"
+      hx-trigger="change"
+      hx-include="#calendar-toggles">
+
+    {{-- preserve current view and anchor date --}}
+    <input type="hidden" name="view" value="{{ $view }}">
+    <input type="hidden" name="date" value="{{ $density['anchor'] ?? request('date') }}">
+    <input type="hidden" name="density" value="{{ $density['step'] ?? 30 }}">
+
+    <x-button.group-input value="0" name="business_hours" :active="!$enabled">All day</x-button.group-input>
+    <x-button.group-input value="1" name="business_hours" :active="$enabled">Business hours</x-button.group-input>
+
+    <noscript>
+        <button type="submit" class="button">{{ __('Apply') }}</button>
+    </noscript>
+</form>
diff --git a/resources/views/components/calendar/time/density.blade.php b/resources/views/components/calendar/time/density.blade.php
index e1d50db..28364bd 100644
--- a/resources/views/components/calendar/time/density.blade.php
+++ b/resources/views/components/calendar/time/density.blade.php
@@ -1,6 +1,7 @@
 @props([
     'density' => [],
     'view' => 'day',
+    'business_hours' => [],
 ])
 
 <form id="calendar-density"
@@ -18,6 +19,7 @@
     {{-- preserve current view and anchor date --}}
     <input type="hidden" name="view" value="{{ $view }}">
     <input type="hidden" name="date" value="{{ $density['anchor'] }}">
+    <input type="hidden" name="business_hours" value="{{ (int) ($business_hours['enabled'] ?? 0) }}">
 
     <x-button.group-input value="15" name="density" :active="(int)($density['step'] ?? 30) === 15">15m</x-button.group-input>
     <x-button.group-input value="30" name="density" :active="(int)($density['step'] ?? 30) === 30">30m</x-button.group-input>
diff --git a/resources/views/components/calendar/week/week.blade.php b/resources/views/components/calendar/week/week.blade.php
index 5d51e5a..8a938d1 100644
--- a/resources/views/components/calendar/week/week.blade.php
+++ b/resources/views/components/calendar/week/week.blade.php
@@ -10,6 +10,7 @@
     'density' => '30',
     'weekstart' => 0,
     'now' => [],
+    'business_hours' => [],
 ])
 
 <section
@@ -17,7 +18,8 @@
     style=
        "--now-row: {{ (int) $now['row'] }};
         --now-col-start: {{ (int) $now['col_start'] }};
-        --now-col-end: {{ (int) $now['col_end'] }};"
+        --now-col-end: {{ (int) $now['col_end'] }};
+        --grid-rows: {{ $business_hours['rows'] ?? 96 }};"
 >
     <hgroup>
         @foreach ($hgroup as $h)
@@ -43,6 +45,7 @@
         @endif
     </ol>
     <footer>
-        <x-calendar.time.density view="week" :density="$density" />
+        <x-calendar.time.business-hours view="week" :density="$density" :business_hours="$business_hours" />
+        <x-calendar.time.density view="week" :density="$density" :business_hours="$business_hours" />
     </footer>
 </section>