Video Average View Time
The average amount of time that an ad clip was played. For example, if a 20-second clip is played by one user for 20 seconds and a second user for 10 seconds, then the average time is calculated as 15.00 seconds. The event is logged when the user plays the ad clip to completion, stops play of the ad clip, or rewinds it. Video Average View Time can't be longer than the duration of the ad clip itself.