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This is one of the things that kills me. Even in broadcasting TV, you get typical :15, :30, :60 ads with the occasional :45 or longer :90.You are absolutely on to something. I think the seemingly random length of ads makes them feel somewhat more jarring to me. I also hate how sometimes the ads are just randomly interjected into a video. I know creators can control this to some degree, but older videos seem to suffer more.
I have had ads on Youtube that were hours long. Obviously, at that length, they can be skipped. I know have some kind of 'trauma response' that when I watch Youtube on a computer while laying down, AFK, I have to have my wireless mouse in close proximity in case one those long ads appears. If I could predict the intervals in which the ads occurred and for how long, then I would probably just let them run and tune them out of my mind.
Regardless, I swear Youtube serves me such long ass ads as a punishment sometimes. Sadly, my suspicion is supported by extremely weak evidence and confirmation bias. I'll just say this... Sometimes when I get served the same ad too many times, I report the ad for something like being offensive, inappropriate, or whatever. The ads seem to never come back, but I swear within a day or two, I start getting longer ads -- even movie-length ads. I have also reported ads if they happen to be something like +30s and unskippable. This makes the ad instantly dismiss (or it used to, at least).