diff --git a/src/routes/api/stats.js b/src/routes/api/stats.js
index 4e8624f..87ad62d 100644
--- a/src/routes/api/stats.js
+++ b/src/routes/api/stats.js
@@ -5,42 +5,62 @@ const User = mongoose.model('User');
 const wrapRoute = require('../../_helpers/wrapRoute');
 
 // round to this number of meters for privacy reasons
-const TRACK_LENGTH_ROUNDING = 1000
+const TRACK_LENGTH_ROUNDING = 1000;
 
 router.get(
   '/',
   wrapRoute(async (req, res) => {
-    const trackCount = await Track.find().count()
-    const publicTrackCount =  await Track.find({visible: true}).count()
-    const userCount =  await User.find().count()
+    const trackCount = await Track.find().count();
+    const publicTrackCount = await Track.find({ visible: true }).count();
+    const userCount = await User.find().count();
 
-    const [{trackLength, publicTrackLength, numEvents}] = await Track.aggregate([
-      {$lookup: { from: 'trackdatas', localField: 'publicTrackData', foreignField: '_id', as: 'publicTrackDatas' }},
-      {$lookup: { from: 'trackdatas', localField: 'trackData', foreignField: '_id', as: 'trackDatas' }},
-      {$addFields: {
-        publicTrackLength: {$first: '$publicTrackDatas.trackLength'},
-        trackLength: {$first: '$trackDatas.trackLength'},
-        numEvents: {$first: '$publicTrackDatas.numEvents'},
-      }},
-      {$project: {publicTrackLength: true, trackLength: true, numEvents: true}},
-      {$group: {_id: "sum",
-        trackLength: {$sum: '$trackLength'},
-        publicTrackLength: {$sum: '$publicTrackLength'},
-        numEvents: {$sum: '$numEvents'},
-      }},
-    ])
+    const [{ trackLength, publicTrackLength, numEvents, trackDuration }] = await Track.aggregate([
+      { $lookup: { from: 'trackdatas', localField: 'publicTrackData', foreignField: '_id', as: 'publicTrackDatas' } },
+      { $lookup: { from: 'trackdatas', localField: 'trackData', foreignField: '_id', as: 'trackDatas' } },
+      {
+        $addFields: {
+          publicTrackData: { $arrayElemAt: ['$publicTrackDatas', 0] },
+          trackData: { $arrayElemAt: ['$trackDatas', 0] },
+        },
+      },
+      {
+        $addFields: {
+          publicTrackLength: '$publicTrackData.trackLength',
+          trackLength: '$trackData.trackLength',
+          numEvents: '$publicTrackData.numEvents',
+          trackDuration: {
+            $cond: [
+              { $and: ['$publicTrackData.recordedUntil', '$publicTrackData.recordedAt'] },
+              { $subtract: ['$publicTrackData.recordedUntil', '$publicTrackData.recordedAt'] },
+              0,
+            ],
+          },
+        },
+      },
+      { $project: { publicTrackLength: true, trackLength: true, numEvents: true, trackDuration: true } },
+      {
+        $group: {
+          _id: 'sum',
+          trackLength: { $sum: '$trackLength' },
+          publicTrackLength: { $sum: '$publicTrackLength' },
+          numEvents: { $sum: '$numEvents' },
+          trackDuration: { $sum: '$trackDuration' },
+        },
+      },
+    ]);
 
     const trackLengthPrivatized = Math.floor(trackLength / TRACK_LENGTH_ROUNDING) * TRACK_LENGTH_ROUNDING;
 
     return res.json({
       publicTrackCount,
       publicTrackLength,
-      trackLength: trackLengthPrivatized ,
+      trackLength: trackLengthPrivatized,
       numEvents,
       trackCount,
+      trackDuration: Math.round(trackDuration / 1000),
       userCount,
     });
-  })
+  }),
 );
 
 module.exports = router;