diff --git a/client/components/app/BookShelfToolbar.vue b/client/components/app/BookShelfToolbar.vue
index b7ecff624..f79346fe9 100644
--- a/client/components/app/BookShelfToolbar.vue
+++ b/client/components/app/BookShelfToolbar.vue
@@ -44,6 +44,14 @@
         <div class="w-6 h-6 rounded-full bg-black/30 flex items-center justify-center ml-3">
           <span class="font-mono">{{ $formatNumber(numShowing) }}</span>
         </div>
+        <div v-if="selectedSeries.totalDuration" class="flex items-center ml-4 text-sm opacity-70 pt-0.5 hidden sm:flex">
+          <template v-if="selectedSeries.progress && selectedSeries.progress.totalDurationListened">
+            <span>{{ $elapsedPretty(selectedSeries.progress.totalDurationListened).replace(' hr', 'h').replace(' min', 'm') }}</span>
+            <span class="mx-1.5">/</span>
+          </template>
+
+          <span>{{ $elapsedPretty(selectedSeries.totalDuration).replace(' hr', 'h').replace(' min', 'm') }}</span>
+        </div>
         <div class="grow" />
 
         <!-- RSS feed -->
diff --git a/server/controllers/LibraryController.js b/server/controllers/LibraryController.js
index 55ef45690..4a1f873cc 100644
--- a/server/controllers/LibraryController.js
+++ b/server/controllers/LibraryController.js
@@ -789,10 +789,15 @@ class LibraryController {
     const seriesJson = series.toOldJSON()
     if (include.includes('progress')) {
       const libraryItemsFinished = libraryItemsInSeries.filter((li) => !!req.user.getMediaProgress(li.media.id)?.isFinished)
+      const totalListened = libraryItemsInSeries.reduce((acc, li) => {
+        const p = req.user.getMediaProgress(li.media.id)
+        return acc + (p?.isFinished ? (li.media.duration || 0) : (p?.currentTime || 0))
+      }, 0)
       seriesJson.progress = {
         libraryItemIds: libraryItemsInSeries.map((li) => li.id),
         libraryItemIdsFinished: libraryItemsFinished.map((li) => li.id),
-        isFinished: libraryItemsFinished.length >= libraryItemsInSeries.length
+        isFinished: libraryItemsFinished.length >= libraryItemsInSeries.length,
+        totalDurationListened: totalListened
       }
     }
 
@@ -801,6 +806,9 @@ class LibraryController {
       seriesJson.rssFeed = feedObj?.toOldJSONMinified() || null
     }
 
+    // populate total duration (same unit as libraryItem.duration)
+    seriesJson.totalDuration = await Database.seriesModel.getTotalDurationById(series.id)
+
     res.json(seriesJson)
   }
 
diff --git a/server/models/Series.js b/server/models/Series.js
index 6ca288464..c6b92ad13 100644
--- a/server/models/Series.js
+++ b/server/models/Series.js
@@ -65,6 +65,37 @@ class Series extends Model {
     series.books = await series.getBooksExpandedWithLibraryItem()
     return series
   }
+  
+  /**
+   *
+   * @param {string} seriesId
+   * @returns {Promise<number>} total duration (same unit as libraryItem.duration)
+   */
+  static async getTotalDurationById(seriesId) {
+    const { book: bookModel, libraryItem: libraryItemModel, bookSeries: bookSeriesModel } = this.sequelize.models
+
+    // Sum durations on libraryItems for books that belong to the series.
+    // This relies on Sequelize associations existing between:
+    // libraryItem -> book, book -> bookSeries (or bookSeries as a through model).
+    const total = await libraryItemModel.sum('duration', {
+      where: { mediaType: 'book' },
+      include: [
+        {
+          model: bookModel,
+          attributes: [],
+          include: [
+            {
+              model: bookSeriesModel,
+              attributes: [],
+              where: { seriesId }
+            }
+          ]
+        }
+      ]
+    })
+
+    return Number(total) || 0
+  }
 
   /**
    *