YouTube started displaying the time video spent watching
Currently, the feature is available in the latest update of the YouTube app on Android devices.
The statistics show 4 main points of the time spent watching the video:
3. Last week.
4. Average daily value.
You can see these statistics by going to the item “Your viewing time” in your account settings.
It also became possible to specify the time interval after which the application will remind you of the need to take a break from watching the video.