The number of times your video was watched for an aggregate of at least 30 seconds, or for nearly its total length, whichever happened first.
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The metric counts when your video was played for an aggregate of 30 seconds or more, or to 97% of its length, whichever happened first. (Example: if someone watches a 5-second video for 4.85 seconds, or a 30-second video for 29.1 seconds, that counts as a 30-second video view.) People frequently drop off before the true end of a video when credits roll, or content fades out, so 97% is considered to be the video’s full length.

The average cost for each 30-second video view.
This metric is calculated as total amount spent, divided by 30-second video views.