input: [Metric] Video view time [Description] 
output: The average time, in seconds, that a video is viewed per view. This number is reached using this calculation: Total Video View Time / Video Plays For example, a 20-second video is viewed by one user for 20 seconds. A second user views the same video for only 10 seconds. The video view time is calculated as 15.00 seconds. Note: If a user drags the scrubber (video timeline) backward or stops the video altogether, the video view time is stopped.