Duration of Playback

Question: When I watch a page playback, the playback time is shorter than the Engagement Time specified for the page. Why can't I see the whole Engagement Time? 

Engagement time is not the same as playback duration (That's the time the playback shows activity).

So if you measure the time of activity in the playback, you will get a shorter time than the engagement time.
 * Engagement time includes any idle time up to 20 seconds.
 * During playback, we skip any idle time of more than 1 second.

Study the 3 images below to understand the relation between engagement time and playback time. Click an image to view it in larger format. 