diff --git a/src/lib/catalog/index.ts b/src/lib/catalog/index.ts
index 6b1edb5..51df8f2 100644
--- a/src/lib/catalog/index.ts
+++ b/src/lib/catalog/index.ts
@@ -1,4 +1,30 @@
-import { db } from '$lib/catalog/db';
+import { page } from '$app/stores';
+import { db, type Catalog } from '$lib/catalog/db';
+import type { Volume } from '$lib/types';
 import { liveQuery } from 'dexie';
+import { derived, type Readable } from 'svelte/store';
 
 export const catalog = liveQuery(() => db.catalog.toArray());
+
+function sortManga(a: Volume, b: Volume) {
+  if (a.volumeName < b.volumeName) {
+    return -1;
+  }
+  if (a.volumeName > b.volumeName) {
+    return 1;
+  }
+  return 0;
+}
+
+
+export const manga = derived([page, catalog as unknown as Readable<Catalog[]>], ([$page, $catalog]) => {
+  if ($page && $catalog) {
+    return $catalog.find((item) => item.id === $page.params.manga)?.manga.sort(sortManga)
+  }
+});
+
+export const volume = derived(([page, manga]), ([$page, $manga]) => {
+  if ($page && $manga) {
+    return $manga.find((item) => item.mokuroData.volume_uuid === $page.params.volume)
+  }
+})
\ No newline at end of file
diff --git a/src/lib/components/Reader/Timer.svelte b/src/lib/components/Reader/Timer.svelte
new file mode 100644
index 0000000..03b842c
--- /dev/null
+++ b/src/lib/components/Reader/Timer.svelte
@@ -0,0 +1,12 @@
+<script lang="ts">
+  import { volumeStats } from '$lib/settings';
+
+  export let active = true;
+</script>
+
+<div
+  class:text-primary-700={!active}
+  class="mix-blend-difference z-10 fixed opacity-50 right-20 top-5 p-10 m-[-2.5rem]"
+>
+  <p>{active ? 'Timer active' : 'Timer idle'} | Minutes read: {$volumeStats?.timeReadInMinutes}</p>
+</div>
diff --git a/src/lib/components/Settings/Reader/ReaderToggles.svelte b/src/lib/components/Settings/Reader/ReaderToggles.svelte
index 4fc5c76..a98b13c 100644
--- a/src/lib/components/Settings/Reader/ReaderToggles.svelte
+++ b/src/lib/components/Settings/Reader/ReaderToggles.svelte
@@ -9,7 +9,8 @@
     { key: 'boldFont', text: 'Bold font', value: $settings.boldFont },
     { key: 'pageNum', text: 'Show page number', value: $settings.pageNum },
     { key: 'charCount', text: 'Show character count', value: $settings.charCount },
-    { key: 'mobile', text: 'Mobile', value: $settings.mobile }
+    { key: 'mobile', text: 'Mobile', value: $settings.mobile },
+    { key: 'showTimer', text: 'Show timer', value: $settings.showTimer }
   ] as { key: SettingsKey; text: string; value: any }[];
 </script>
 
diff --git a/src/lib/components/Settings/Stats.svelte b/src/lib/components/Settings/Stats.svelte
index e6cf4bb..e1bc851 100644
--- a/src/lib/components/Settings/Stats.svelte
+++ b/src/lib/components/Settings/Stats.svelte
@@ -1,44 +1,14 @@
 <script lang="ts">
-  import { volumes } from '$lib/settings';
-  import { AccordionItem, P } from 'flowbite-svelte';
-
-  $: completed = $volumes
-    ? Object.values($volumes).reduce((total: number, { completed }) => {
-        if (completed) {
-          total++;
-        }
-        return total;
-      }, 0)
-    : 0;
-
-  $: pagesRead = $volumes
-    ? Object.values($volumes).reduce((total: number, { progress }) => {
-        total += progress;
-        return total;
-      }, 0)
-    : 0;
-
-  $: charsRead = $volumes
-    ? Object.values($volumes).reduce((total: number, { chars }) => {
-        total += chars;
-        return total;
-      }, 0)
-    : 0;
-
-  $: minutesRead = $volumes
-    ? Object.values($volumes).reduce((total: number, { timeReadInMinutes }) => {
-        total += timeReadInMinutes;
-        return total;
-      }, 0)
-    : 0;
+  import { totalStats } from '$lib/settings';
+  import { AccordionItem } from 'flowbite-svelte';
 </script>
 
 <AccordionItem>
   <span slot="header">Stats</span>
   <div>
-    <p>Completed volumes: {completed}</p>
-    <p>Pages read: {pagesRead}</p>
-    <p>Characters read: {charsRead}</p>
-    <p>Minutes read: {minutesRead}</p>
+    <p>Completed volumes: {$totalStats?.completed || 0}</p>
+    <p>Pages read: {$totalStats?.pagesRead || 0}</p>
+    <p>Characters read: {$totalStats?.charsRead || 0}</p>
+    <p>Minutes read: {$totalStats?.minutesRead || 0}</p>
   </div>
 </AccordionItem>
diff --git a/src/lib/settings/settings.ts b/src/lib/settings/settings.ts
index b735e1a..cc02435 100644
--- a/src/lib/settings/settings.ts
+++ b/src/lib/settings/settings.ts
@@ -49,6 +49,7 @@ export type Settings = {
   mobile: boolean;
   backgroundColor: string;
   swipeThreshold: number;
+  showTimer: boolean;
   fontSize: FontSize;
   zoomDefault: ZoomModes;
   volumeDefaults: VolumeDefaults;
@@ -71,6 +72,7 @@ const defaultSettings: Settings = {
   mobile: false,
   backgroundColor: '#030712',
   swipeThreshold: 50,
+  showTimer: false,
   fontSize: 'auto',
   zoomDefault: 'zoomFitToScreen',
   volumeDefaults: {
diff --git a/src/lib/settings/volume-data.ts b/src/lib/settings/volume-data.ts
index 8c55792..237624b 100644
--- a/src/lib/settings/volume-data.ts
+++ b/src/lib/settings/volume-data.ts
@@ -2,6 +2,8 @@ import { browser } from '$app/environment';
 import { derived, get, writable } from 'svelte/store';
 import { settings } from './settings';
 import { zoomDefault } from '$lib/panzoom';
+import { page } from '$app/stores';
+import { manga, volume } from '$lib/catalog';
 
 export type VolumeSettings = {
   rightToLeft: boolean;
@@ -21,6 +23,13 @@ type VolumeData = {
   settings: VolumeSettings;
 }
 
+type TotalStats = {
+  completed: number;
+  pagesRead: number;
+  charsRead: number;
+  minutesRead: number;
+}
+
 type Volumes = Record<string, VolumeData>;
 
 
@@ -132,4 +141,51 @@ export function updateVolumeSetting(volume: string, key: VolumeSettingsKey, valu
     };
   });
   zoomDefault();
-}
\ No newline at end of file
+}
+
+export const totalStats = derived([volumes, page], ([$volumes, $page]) => {
+  if ($page && $volumes) {
+    return Object.values($volumes).reduce<TotalStats>((stats, { chars, completed, timeReadInMinutes, progress }) => {
+      if (completed) {
+        stats.completed++;
+      }
+
+      stats.pagesRead += progress;
+      stats.minutesRead += timeReadInMinutes;
+      stats.charsRead += chars
+
+      return stats;
+    }, {
+      charsRead: 0,
+      completed: 0,
+      pagesRead: 0,
+      minutesRead: 0
+    })
+  }
+})
+
+export const mangaStats = derived([manga, volumes], ([$manga, $volumes]) => {
+  if ($manga && $volumes) {
+    return $manga.map((vol) => vol.mokuroData.volume_uuid).reduce(
+      (stats: any, volumeId) => {
+        const timeReadInMinutes = $volumes[volumeId]?.timeReadInMinutes || 0;
+        const chars = $volumes[volumeId]?.chars || 0;
+        const completed = $volumes[volumeId]?.completed || 0;
+
+        stats.timeReadInMinutes = stats.timeReadInMinutes + timeReadInMinutes;
+        stats.chars = stats.chars + chars;
+        stats.completed = stats.completed + completed;
+
+        return stats;
+      },
+      { timeReadInMinutes: 0, chars: 0, completed: 0 }
+    );
+  }
+});
+
+export const volumeStats = derived([volume, volumes], ([$volume, $volumes]) => {
+  if ($volume && $volumes) {
+    const { chars, completed, timeReadInMinutes, progress } = $volumes[$volume.mokuroData.volume_uuid]
+    return { chars, completed, timeReadInMinutes, progress }
+  }
+});
\ No newline at end of file
diff --git a/src/routes/[manga]/+page.svelte b/src/routes/[manga]/+page.svelte
index ab9d0a1..0995ec4 100644
--- a/src/routes/[manga]/+page.svelte
+++ b/src/routes/[manga]/+page.svelte
@@ -7,7 +7,7 @@
   import { promptConfirmation, zipManga } from '$lib/util';
   import { page } from '$app/stores';
   import type { Volume } from '$lib/types';
-  import { deleteVolume, volumes } from '$lib/settings';
+  import { deleteVolume, mangaStats, volumes } from '$lib/settings';
 
   function sortManga(a: Volume, b: Volume) {
     if (a.volumeName < b.volumeName) {
@@ -66,15 +66,15 @@
 <svelte:head>
   <title>{manga?.[0].mokuroData.title || 'Manga'}</title>
 </svelte:head>
-{#if manga}
+{#if manga && $mangaStats}
   <div class="p-2 flex flex-col gap-5">
     <div class="flex flex-row justify-between">
       <div class="flex flex-col gap-2">
         <h3 class="font-bold">{manga[0].mokuroData.title}</h3>
         <div class="flex flex-col gap-0 sm:flex-row sm:gap-5">
-          <p>Volumes: {stats.completed} / {manga.length}</p>
-          <p>Characters read: {stats.chars}</p>
-          <p>Minutes read: {stats.timeReadInMinutes}</p>
+          <p>Volumes: {$mangaStats.completed} / {manga.length}</p>
+          <p>Characters read: {$mangaStats.chars}</p>
+          <p>Minutes read: {$mangaStats.timeReadInMinutes}</p>
         </div>
       </div>
       <div class="sm:block flex-col flex gap-2">
diff --git a/src/routes/[manga]/[volume]/+page.svelte b/src/routes/[manga]/[volume]/+page.svelte
index ca6ac34..a5805e2 100644
--- a/src/routes/[manga]/[volume]/+page.svelte
+++ b/src/routes/[manga]/[volume]/+page.svelte
@@ -1,24 +1,73 @@
 <script lang="ts">
   import { page } from '$app/stores';
   import Reader from '$lib/components/Reader/Reader.svelte';
-  import { initializeVolume, startCount, volumeSettings, volumes } from '$lib/settings';
+  import Timer from '$lib/components/Reader/Timer.svelte';
+  import { initializeVolume, settings, startCount, volumeSettings, volumes } from '$lib/settings';
   import { onMount } from 'svelte';
 
   const volumeId = $page.params.volume;
+  let count: undefined | number = undefined;
+  let inactiveTimer: undefined | number = undefined;
+  let inactive = false;
 
   onMount(() => {
     if (!$volumes?.[volumeId]) {
       initializeVolume(volumeId);
     }
 
-    const count = startCount(volumeId);
+    count = startCount(volumeId);
 
     return () => {
       clearInterval(count);
+      count = undefined;
     };
   });
+
+  function onBlur() {
+    // This is an attempt to pause the timer when the page loses focus, but
+    // keep it going if focus is given to an extension such as yomitan
+    if (
+      document.activeElement?.innerHTML.includes('moz-extension') ||
+      !Boolean(document.activeElement?.innerHTML)
+    ) {
+      return;
+    }
+
+    clearInterval(count);
+    count = undefined;
+  }
+
+  function onFocus() {
+    count = startCount(volumeId);
+  }
+
+  function resetInactiveTimer() {
+    if (inactive && !count) {
+      count = startCount(volumeId);
+    }
+
+    clearTimeout(inactiveTimer);
+    inactive = false;
+
+    inactiveTimer = setTimeout(() => {
+      clearInterval(count);
+      count = undefined;
+      inactive = true;
+    }, 15 * 1000);
+  }
 </script>
 
+<svelte:window
+  on:blur={onBlur}
+  on:focus={onFocus}
+  on:load={resetInactiveTimer}
+  on:mousemove={resetInactiveTimer}
+  on:keydown={resetInactiveTimer}
+/>
+
 {#if $volumeSettings[volumeId]}
+  {#if $settings.showTimer}
+    <Timer active={Boolean(count)} />
+  {/if}
   <Reader volumeSettings={$volumeSettings[volumeId]} />
 {/if}