diff --git a/client/components/app/MediaPlayerContainer.vue b/client/components/app/MediaPlayerContainer.vue
index 1a2b1d30..00594be1 100644
--- a/client/components/app/MediaPlayerContainer.vue
+++ b/client/components/app/MediaPlayerContainer.vue
@@ -159,8 +159,7 @@ export default {
       return this.streamLibraryItem?.libraryId || null
     },
     totalDurationPretty() {
-      // Adjusted by playback rate
-      return this.$secondsToTimestamp(this.totalDuration / this.currentPlaybackRate)
+      return this.$secondsToTimestamp(this.totalDuration)
     },
     podcastAuthor() {
       if (!this.isPodcast) return null
diff --git a/client/components/modals/BookmarksModal.vue b/client/components/modals/BookmarksModal.vue
index d84a8ed8..ea355d3a 100644
--- a/client/components/modals/BookmarksModal.vue
+++ b/client/components/modals/BookmarksModal.vue
@@ -20,7 +20,7 @@
           <div class="flex px-4 py-2 items-center text-center border-b border-white/10 text-white/80">
             <div class="w-16 max-w-16 text-center">
               <p class="text-sm font-mono text-gray-400">
-                {{ this.$secondsToTimestamp(currentTime / playbackRate) }}
+                {{ this.$secondsToTimestamp(currentTime) }}
               </p>
             </div>
             <div class="grow px-2">
diff --git a/client/components/modals/ChaptersModal.vue b/client/components/modals/ChaptersModal.vue
index 7b7368b7..eb073273 100644
--- a/client/components/modals/ChaptersModal.vue
+++ b/client/components/modals/ChaptersModal.vue
@@ -2,13 +2,13 @@
   <modals-modal v-model="show" name="chapters" :width="600" :height="'unset'">
     <div id="chapter-modal-wrapper" ref="container" class="w-full rounded-lg bg-bg box-shadow-md overflow-y-auto overflow-x-hidden" style="max-height: 80vh">
       <template v-for="chap in chapters">
-        <div :key="chap.id" :id="`chapter-row-${chap.id}`" class="flex items-center px-6 py-3 justify-start cursor-pointer relative" :class="chap.id === currentChapterId ? 'bg-yellow-400/20 hover:bg-yellow-400/10' : chap.end / _playbackRate <= currentChapterStart ? 'bg-success/10 hover:bg-success/5' : 'hover:bg-primary/10'" @click="clickChapter(chap)">
+        <div :key="chap.id" :id="`chapter-row-${chap.id}`" class="flex items-center px-6 py-3 justify-start cursor-pointer relative" :class="chap.id === currentChapterId ? 'bg-yellow-400/20 hover:bg-yellow-400/10' : chap.end <= currentChapterStart ? 'bg-success/10 hover:bg-success/5' : 'hover:bg-primary/10'" @click="clickChapter(chap)">
           <p class="chapter-title truncate text-sm md:text-base">
             {{ chap.title }}
           </p>
-          <span class="font-mono text-xxs sm:text-xs text-gray-400 pl-2 whitespace-nowrap">{{ $elapsedPrettyExtended((chap.end - chap.start) / _playbackRate) }}</span>
+          <span class="font-mono text-xxs sm:text-xs text-gray-400 pl-2 whitespace-nowrap">{{ $elapsedPrettyExtended(chap.end - chap.start) }}</span>
           <span class="grow" />
-          <span class="font-mono text-xs sm:text-sm text-gray-300">{{ $secondsToTimestamp(chap.start / _playbackRate) }}</span>
+          <span class="font-mono text-xs sm:text-sm text-gray-300">{{ $secondsToTimestamp(chap.start) }}</span>
 
           <div v-show="chap.id === currentChapterId" class="w-0.5 h-full absolute top-0 left-0 bg-yellow-400" />
         </div>
@@ -43,15 +43,11 @@ export default {
         this.$emit('input', val)
       }
     },
-    _playbackRate() {
-      if (!this.playbackRate || isNaN(this.playbackRate)) return 1
-      return this.playbackRate
-    },
     currentChapterId() {
       return this.currentChapter?.id || null
     },
     currentChapterStart() {
-      return (this.currentChapter?.start || 0) / this._playbackRate
+      return this.currentChapter?.start || 0
     }
   },
   methods: {
diff --git a/client/components/player/PlayerTrackBar.vue b/client/components/player/PlayerTrackBar.vue
index 2d09ea53..fda007d5 100644
--- a/client/components/player/PlayerTrackBar.vue
+++ b/client/components/player/PlayerTrackBar.vue
@@ -189,7 +189,7 @@ export default {
         this.$refs.hoverTimestampArrow.style.left = posLeft + 'px'
       }
       if (this.$refs.hoverTimestampText) {
-        var hoverText = this.$secondsToTimestamp(progressTime / this._playbackRate)
+        var hoverText = this.$secondsToTimestamp(progressTime)
 
         var chapter = this.chapters.find((chapter) => chapter.start <= totalTime && totalTime < chapter.end)
         if (chapter && chapter.title) {
diff --git a/client/components/player/PlayerUi.vue b/client/components/player/PlayerUi.vue
index 64fee1ad..3a66d7dc 100644
--- a/client/components/player/PlayerUi.vue
+++ b/client/components/player/PlayerUi.vue
@@ -132,9 +132,9 @@ export default {
     timeRemaining() {
       if (this.useChapterTrack && this.currentChapter) {
         var currChapTime = this.currentTime - this.currentChapter.start
-        return (this.currentChapterDuration - currChapTime) / this.playbackRate
+        return this.currentChapterDuration - currChapTime
       }
-      return (this.duration - this.currentTime) / this.playbackRate
+      return this.duration - this.currentTime
     },
     timeRemainingPretty() {
       if (this.timeRemaining < 0) {
@@ -309,7 +309,7 @@ export default {
         return
       }
       const time = this.useChapterTrack ? Math.max(0, this.currentTime - this.currentChapterStart) : this.currentTime
-      ts.innerText = this.$secondsToTimestamp(time / this.playbackRate)
+      ts.innerText = this.$secondsToTimestamp(time)
     },
     setBufferTime(bufferTime) {
       if (this.$refs.trackbar) this.$refs.trackbar.setBufferTime(bufferTime)
diff --git a/client/cypress/tests/players/LocalAudioPlayer.cy.js b/client/cypress/tests/players/LocalAudioPlayer.cy.js
new file mode 100644
index 00000000..03765479
--- /dev/null
+++ b/client/cypress/tests/players/LocalAudioPlayer.cy.js
@@ -0,0 +1,110 @@
+import LocalAudioPlayer from '../../../players/LocalAudioPlayer'
+
+describe('LocalAudioPlayer', () => {
+  let mockPort;
+  let mockAudioContext;
+  let mockAudioWorkletNode;
+
+  beforeEach(() => {
+    // Mock for AudioWorkletNode message port
+    mockPort = {
+      onmessage: null,
+      postMessage: cy.stub()
+    };
+
+    // Mock AudioWorkletNode
+    mockAudioWorkletNode = {
+      port: mockPort,
+      connect: cy.stub(),
+      disconnect: cy.stub()
+    };
+
+    // Mock AudioContext
+    mockAudioContext = {
+      audioWorklet: {
+        addModule: cy.stub().resolves()
+      },
+      createMediaElementSource: cy.stub().returns({
+        connect: cy.stub(),
+        disconnect: cy.stub()
+      }),
+      destination: {},
+      state: 'running',
+      currentTime: 10
+    };
+
+    // Make AudioWorkletNode available globally so `new AudioWorkletNode` works
+    if (!window.AudioWorkletNode) {
+      window.AudioWorkletNode = function() { return mockAudioWorkletNode; };
+    } else {
+      cy.stub(window, 'AudioWorkletNode').returns(mockAudioWorkletNode);
+    }
+    
+    if (!window.AudioContext) {
+      window.AudioContext = function() { return mockAudioContext; };
+    } else {
+      cy.stub(window, 'AudioContext').returns(mockAudioContext);
+    }
+    
+    if (window.webkitAudioContext) {
+      cy.stub(window, 'webkitAudioContext').returns(mockAudioContext);
+    }
+  });
+
+  it('increases playbackRate during silence', () => {
+    const localPlayer = new LocalAudioPlayer({});
+    
+    // Default playback rate should be 1
+    expect(localPlayer.player.playbackRate).to.equal(1);
+    
+    cy.wrap(localPlayer).should('have.property', 'usingWebAudio', true).then(() => {
+      // Enable smart speed (this should trigger initSilenceDetector)
+      return localPlayer.setSmartSpeed(true);
+    }).then(() => {
+      expect(localPlayer.enableSmartSpeed).to.be.true;
+      expect(mockAudioContext.audioWorklet.addModule).to.have.been.calledWith('/client/players/smart-speed/SilenceDetectorProcessor.js');
+      expect(localPlayer.silenceDetectorNode).to.equal(mockAudioWorkletNode);
+      
+      // Simulate silence start
+      mockPort.onmessage({
+        data: {
+          type: 'silence-start',
+          time: 5000 // 5 seconds
+        }
+      });
+      
+      // The smartSpeedRatio is 2.0 by default, so playbackRate should be 2.0
+      expect(localPlayer.player.playbackRate).to.equal(2.0);
+      
+      // Simulate silence end
+      mockPort.onmessage({
+        data: {
+          type: 'silence-end',
+          time: 8000 // 8 seconds
+        }
+      });
+      
+      // Should return to default 1.0
+      expect(localPlayer.player.playbackRate).to.equal(1.0);
+    });
+  });
+
+  it('maps currentTime, duration, and seek through the same Smart Speed wall-clock contract', () => {
+    const localPlayer = new LocalAudioPlayer({});
+
+    localPlayer.audioTracks = [{ startOffset: 0, duration: 12 }];
+    localPlayer.currentTrackIndex = 0;
+    localPlayer.enableSmartSpeed = true;
+    localPlayer.smartSpeedRatio = 2.0;
+    localPlayer.silenceMap.addRegion(2000, 6000);
+    localPlayer.updateSmartSpeedRegions();
+
+    localPlayer.player.currentTime = 8;
+
+    expect(localPlayer.getCurrentTime()).to.equal(6);
+    expect(localPlayer.getDuration()).to.equal(10);
+
+    localPlayer.seek(6, false);
+    expect(localPlayer.player.currentTime).to.equal(8);
+  });
+});
diff --git a/client/players/LocalAudioPlayer.js b/client/players/LocalAudioPlayer.js
index ef566e2c..fe6ec9be 100644
--- a/client/players/LocalAudioPlayer.js
+++ b/client/players/LocalAudioPlayer.js
@@ -399,14 +399,21 @@ export default class LocalAudioPlayer extends EventEmitter {
   getCurrentTime() {
     var currentTrackOffset = this.currentTrack.startOffset || 0
     if (!this.player) return 0
-    
+
+    if (this.enableSmartSpeed) {
+      return this.timeMapper.audioToWallClock((currentTrackOffset + this.player.currentTime) * 1000) / 1000
+    }
     return currentTrackOffset + this.player.currentTime
   }
 
   getDuration() {
     if (!this.audioTracks.length) return 0
     var lastTrack = this.audioTracks[this.audioTracks.length - 1]
-    return lastTrack.startOffset + lastTrack.duration
+    const duration = lastTrack.startOffset + lastTrack.duration
+    if (this.enableSmartSpeed) {
+      return this.timeMapper.audioToWallClock(duration * 1000) / 1000
+    }
+    return duration
   }
 
   setPlaybackRate(playbackRate) {
@@ -435,6 +442,10 @@ export default class LocalAudioPlayer extends EventEmitter {
 
     var mappedTime = time
 
+    if (this.enableSmartSpeed) {
+      mappedTime = this.timeMapper.wallClockToAudio(time * 1000) / 1000
+    }
+
     if (this.silenceDetectorNode) {
       this.silenceDetectorNode.port.postMessage({ type: 'reset' })
       this._silenceStartTime = null
diff --git a/test/server/models/MediaProgress.test.js b/test/server/models/MediaProgress.test.js
new file mode 100644
index 00000000..cf48a8d9
--- /dev/null
+++ b/test/server/models/MediaProgress.test.js
@@ -0,0 +1,46 @@
+const { expect } = require('chai')
+const { Sequelize } = require('sequelize')
+
+const Database = require('../../../server/Database')
+
+describe('MediaProgress', () => {
+  beforeEach(async () => {
+    global.ServerSettings = {}
+    Database.sequelize = new Sequelize({ dialect: 'sqlite', storage: ':memory:', logging: false })
+    Database.sequelize.uppercaseFirst = (str) => (str ? `${str[0].toUpperCase()}${str.substr(1)}` : '')
+    await Database.buildModels()
+    await Database.sequelize.sync({ force: true })
+  })
+
+  afterEach(async () => {
+    await Database.sequelize.close()
+  })
+
+  it('marks progress finished using coherent wall-clock currentTime and duration values', async () => {
+    const user = await Database.userModel.create({
+      username: 'user1',
+      pash: 'hashed_password_1',
+      type: 'user',
+      isActive: true
+    })
+
+    const progress = await Database.mediaProgressModel.create({
+      userId: user.id,
+      mediaItemId: '00000000-0000-0000-0000-000000000001',
+      mediaItemType: 'book',
+      duration: 10,
+      currentTime: 0,
+      isFinished: false,
+      extraData: {}
+    })
+
+    await progress.applyProgressUpdate({
+      currentTime: 9.5,
+      duration: 10,
+      markAsFinishedTimeRemaining: 1
+    })
+
+    expect(progress.isFinished).to.equal(true)
+    expect(progress.progress).to.equal(0.95)
+  })
+})
diff --git a/test/server/objects/PlaybackSession.test.js b/test/server/objects/PlaybackSession.test.js
new file mode 100644
index 00000000..19a54289
--- /dev/null
+++ b/test/server/objects/PlaybackSession.test.js
@@ -0,0 +1,26 @@
+const { expect } = require('chai')
+
+const PlaybackSession = require('../../../server/objects/PlaybackSession')
+
+describe('PlaybackSession', () => {
+  it('computes progress from a single currentTime and duration domain', () => {
+    const session = new PlaybackSession({
+      id: 'session-1',
+      userId: 'user-1',
+      libraryItemId: 'item-1',
+      mediaType: 'book',
+      duration: 10,
+      currentTime: 6,
+      startedAt: Date.now(),
+      updatedAt: Date.now(),
+      deviceInfo: {}
+    })
+
+    expect(session.progress).to.equal(0.6)
+    expect(session.mediaProgressObject).to.include({
+      duration: 10,
+      currentTime: 6,
+      progress: 0.6
+    })
+  })
+})