They stuff in precisely the prime-time limit of 12 commercial minutes per hour. Aggravating this, however, is the fact that they can run as many minutes of PROMOS for other Fox programs as the audience will tolerate. So if they do six breaks per hour, that's 2 minutes (4 :30 spots) of commercials and probably another 1:30 to 2:00 of Fox promos per break. That comes to 24 minutes of non-program material per hour, which is really pushing it. Most breaks don't have that many promos, but I've seen some that have come close. SeeBS is the worst - I've seen them frequently run SIX show promos per break, albeit :10's and :15's.
Michael
Didn't the standard used to be 20 minutes per hour? Now it's up to 24? That explains why it's so intolerable. You can really feel every excrutiating minute of non-show. I think the solution is to tape it and then watch it - that way you can fast forward through the interminable commercials.