I shot a USPSA match almost every weekend, from 1998-2010. Since I was often part of the match staff, I was usually either at the range early, late, or both, so my time commitment is/was often six hours, or more, to shoot for five minutes. You have to find a way to enjoy the whole experience, not just the shooting, or you will never be able to justify the time commitment. My competitive juices don't flow like they used to, so I get more enjoyment out of the socializing, and taking breaks from that to work as a Range Officer (or is that the other way around?), to fill the time that would otherwise be a lot of standing around.
In my area, the weekly "outdoor" matches might have as many as 60-70 competitors, but there are some smaller matches at the various indoor ranges. I used to shoot a Friday-night match that consisted of three, 18-round stages, and there'd usually be 15-20 shooters, so it went pretty quickly.