diff --git a/server/controllers/LibraryItemController.js b/server/controllers/LibraryItemController.js
index 07b4ee67f..ddfe2fa34 100644
--- a/server/controllers/LibraryItemController.js
+++ b/server/controllers/LibraryItemController.js
@@ -507,6 +507,8 @@ class LibraryItemController {
 
     req.libraryItem.media.audioFiles = updatedAudioFiles
     req.libraryItem.media.changed('audioFiles', true)
+    // Recompute duration so disabled (excluded) tracks no longer count toward the total
+    req.libraryItem.media.updateDuration()
     await req.libraryItem.media.save()
 
     SocketAuthority.libraryItemEmitter('item_updated', req.libraryItem)
diff --git a/server/models/Book.js b/server/models/Book.js
index d9f2ff132..2e4d59bee 100644
--- a/server/models/Book.js
+++ b/server/models/Book.js
@@ -261,6 +261,19 @@ class Book extends Model {
     return this.audioFiles.filter((af) => !af.exclude)
   }
 
+  /**
+   * Recalculate the book duration from the included (non-excluded) audio files.
+   * Sets `this.duration` and returns whether it changed.
+   *
+   * @returns {boolean}
+   */
+  updateDuration() {
+    const newDuration = this.includedAudioFiles.reduce((total, af) => total + (isNaN(af.duration) ? 0 : Number(af.duration)), 0)
+    if (this.duration === newDuration) return false
+    this.duration = newDuration
+    return true
+  }
+
   get hasMediaFiles() {
     return !!this.hasAudioTracks || !!this.ebookFile
   }
diff --git a/server/scanner/BookScanner.js b/server/scanner/BookScanner.js
index 8ae616fe8..ade7260d9 100644
--- a/server/scanner/BookScanner.js
+++ b/server/scanner/BookScanner.js
@@ -136,12 +136,8 @@ class BookScanner {
 
       media.audioFiles = AudioFileScanner.runSmartTrackOrder(existingLibraryItem.relPath, media.audioFiles)
 
-      media.duration = 0
-      media.audioFiles.forEach((af) => {
-        if (!isNaN(af.duration)) {
-          media.duration += af.duration
-        }
-      })
+      // Recompute duration from included (non-excluded) tracks so disabled tracks don't get re-counted on rescan
+      media.updateDuration()
 
       media.changed('audioFiles', true)
     }
diff --git a/test/server/controllers/LibraryItemController.test.js b/test/server/controllers/LibraryItemController.test.js
index 1d57219d3..c19059533 100644
--- a/test/server/controllers/LibraryItemController.test.js
+++ b/test/server/controllers/LibraryItemController.test.js
@@ -8,6 +8,7 @@ const LibraryItemController = require('../../../server/controllers/LibraryItemCo
 const ApiCacheManager = require('../../../server/managers/ApiCacheManager')
 const Auth = require('../../../server/Auth')
 const Logger = require('../../../server/Logger')
+const SocketAuthority = require('../../../server/SocketAuthority')
 
 describe('LibraryItemController', () => {
   /** @type {ApiRouter} */
@@ -299,4 +300,41 @@ describe('LibraryItemController', () => {
       expect(fakeRes.sendStatus.calledWith(403)).to.be.true
     })
   })
+
+  describe('updateTracks', () => {
+    it('recomputes book duration to exclude disabled audio tracks', async () => {
+      const library = await Database.libraryModel.create({ name: 'Tracks Library', mediaType: 'book' })
+      const libraryFolder = await Database.libraryFolderModel.create({ path: '/tracks', libraryId: library.id })
+
+      // Book with two audio tracks (100s + 50s) and a stored duration of 150s
+      const audioFiles = [
+        { index: 1, ino: 'file-1', duration: 100, exclude: false, metadata: { filename: 'track1.mp3', size: 1000 } },
+        { index: 2, ino: 'file-2', duration: 50, exclude: false, metadata: { filename: 'track2.mp3', size: 1000 } }
+      ]
+      const book = await Database.bookModel.create({ title: 'Two Track Book', duration: 150, audioFiles, tags: [], narrators: [], genres: [], chapters: [] })
+      const libraryItem = await Database.libraryItemModel.create({ libraryFiles: [], mediaId: book.id, mediaType: 'book', libraryId: library.id, libraryFolderId: libraryFolder.id })
+
+      sinon.stub(SocketAuthority, 'libraryItemEmitter')
+
+      const expandedLibraryItem = await Database.libraryItemModel.getExpandedById(libraryItem.id)
+      const fakeReq = {
+        libraryItem: expandedLibraryItem,
+        body: {
+          orderedFileData: [
+            { ino: 'file-1', exclude: false },
+            { ino: 'file-2', exclude: true }
+          ]
+        }
+      }
+      const fakeRes = { json: sinon.spy(), sendStatus: sinon.spy() }
+
+      await LibraryItemController.updateTracks.bind(apiRouter)(fakeReq, fakeRes)
+
+      expect(fakeRes.json.calledOnce).to.be.true
+
+      // Duration should now reflect only the enabled track (100s), not the original 150s
+      const updatedBook = await Database.bookModel.findByPk(book.id)
+      expect(updatedBook.duration).to.equal(100)
+    })
+  })
 })
diff --git a/test/server/models/Book.test.js b/test/server/models/Book.test.js
new file mode 100644
index 000000000..162dbe92c
--- /dev/null
+++ b/test/server/models/Book.test.js
@@ -0,0 +1,62 @@
+const { expect } = require('chai')
+const { Sequelize } = require('sequelize')
+
+const Database = require('../../../server/Database')
+
+describe('Book', () => {
+  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()
+  })
+
+  afterEach(async () => {
+    await Database.sequelize.sync({ force: true })
+  })
+
+  describe('updateDuration', () => {
+    it('sums only the included (non-excluded) audio files', () => {
+      const book = Database.bookModel.build({
+        title: 'Test Book',
+        duration: 0,
+        audioFiles: [
+          { ino: '1', duration: 100, exclude: false },
+          { ino: '2', duration: 50, exclude: true },
+          { ino: '3', duration: 25, exclude: false }
+        ]
+      })
+
+      const changed = book.updateDuration()
+
+      expect(book.duration).to.equal(125) // 100 + 25, the excluded 50 is ignored
+      expect(changed).to.be.true
+    })
+
+    it('returns false and leaves duration unchanged when already correct', () => {
+      const book = Database.bookModel.build({
+        title: 'Test Book',
+        duration: 100,
+        audioFiles: [{ ino: '1', duration: 100, exclude: false }]
+      })
+
+      expect(book.updateDuration()).to.be.false
+      expect(book.duration).to.equal(100)
+    })
+
+    it('ignores audio files with a non-numeric duration', () => {
+      const book = Database.bookModel.build({
+        title: 'Test Book',
+        duration: 0,
+        audioFiles: [
+          { ino: '1', duration: 100, exclude: false },
+          { ino: '2', duration: NaN, exclude: false }
+        ]
+      })
+
+      book.updateDuration()
+
+      expect(book.duration).to.equal(100)
+    })
+  })
+})