As mentioned above, generally speaking AP credits don’t help that much at the UCs, but it depends on which major, which school/college and which university. Students often come in with 25-50 AP credits and theoretically they do count towards graduation, but you’ll probably find that you’ll go well over the 120-180 Unit threshold because of requirements anyways, plus some of the credits become null credits, ie one you take a class at the college level it replaces the AP credit.
I would say though that for the UCs, saving one semester or two quarters is a reasonable expectation for the right APs.