Monetization and video length correlation

Hello all,

I would like to know is there any knowledge or info about what is a difference in video income depending on length. Like what is a difference for 1min and 20 sec video vs lets say 2min and 30 sec video or 3 min video.
I know that 8 min video can add 1 extra add so its double income.

It depends on the engagement and audience retention of your video. so i guess the long video should keep your audience watching for longer, if they are interested in the content.
Since income generation on YouTube is also determined by numbers of view and engagement.

From my experience the only factor is the amount of ads - videos under 8 mins can only have 2 ad breaks - before the video, and after. It doesn't matter if you have 1 min or 5 min video.