So.... @TeamYouTube added non-skippable ads to my account. The need for MCNs has basically completely vanished now. I don't say this often guys, so revel in it...
Good job.
Personally, if I run into a non skippable ad that is longer than 1 minute, I will refresh the page until I get a different one. That is, of course, limited to channels I feel are not worth the extra time. Channels that I do support might even get 10 extra minutes for that ad.