in the US it's typically more like 22 minutes

That is correct.

I have a question for the US people, though. How does Cartoon Network get away with their wonderful commercial scheduling? So far, from what I've seen, every Cartoon Network show has a single, normal length commercial break in the middle of the show, then one long one at the end. At least the Adult Swim shows do, but I've seen it during DBZ as well.

I think this is just wonderful. Even if I didn't have Tivo, which means I'm only getting one tiny interruption in my program, that long commercial break at the end gives me time to go do things before the next show comes up, or that show is over sooner and I can go on to other things quicker. I just love it.