Pacific Standard Time is so big it's hard to get your mind around it. But you'll have plenty of time, since it's scheduled to start on the first of October and some exhibitions already are under way. There will be at least 60 altogether, at Los Angeles' major museums and some galleries, in addition to performance, public art and dance. The full title is Pacific Standard Time: Art in LA, 1945-1980. The Getty is providing $10 million.