I was thinking about who to spend my Prime sub on this month, and decided I would do it based on which channel I watched the most in the past month. But it looks like the only way for me to know that right now is just to guess off the top of my head. It would be nice to be able to see our personal watch history sorted by total time viewed. This could be both in the past 30 days as well as all-time total viewing time (if this is recorded).

An example of something similar would be how Steam can show you your playtime for any games you've played in the past two weeks, as well as your top played games of all time.