Why would you need to fake whether you watched a video? Just let it play while you do something else. If it still bothers you how long it takes, put it on 2x speed.
It was part of the homework, we had to watch a video and write down notes in a physical notebook. The notebook was never checked because they assumed that a video watched >=1x meant that we understood the task. The videos took a while to watch so we'd rather skip.