Youtube definitely switched at some point from rewarding number of views (which incentivized short content: 10 minutes was a bit of a meme for a bit because tha

Youtube definitely switched at some point from rewarding number of views (which incentivized short content: 10 minutes was a bit of a meme for a bit because that was the minimum for monetizing) to rewarding watch time (which incentivizes longer content: suddenly people noticed VODs of 6 hour livestreams doing numbers), as far as their recommendations and ad rewards worked. I wouldn't be surprised if they take the video speed adjustment into consideration such that the suggested action would contribute.