I've encountered one 25 minute ad on YouTube, I don't recall what it was for though. I laughed and reloaded the page, and off to the races. I've also encounter

I've encountered one 25 minute ad on YouTube, I don't recall what it was for though. I laughed and reloaded the page, and off to the races. I've also encountered a number that range in the 5-10 minute range. I don't use YouTube very often, so I'm not sure how regularly these occur.