Videos under 10 minutes can only have 1 ad (I'm not sure but I think it's only short ads too) so you get less revenue per video. The algorithm also favors longe

Videos under 10 minutes can only have 1 ad (I'm not sure but I think it's only short ads too) so you get less revenue per video. The algorithm also favors longer videos because more watch time means the video is more likely to be recommended to viewers. But there are rumours that being over 10 minutes specifically is what matters most to the YouTube algo.