I'm in a similar situation right now, only it's balancing school and the gym. I wanted to go twice a week, but due to my class schedule and the amount of homework/tests, I can only do Friday evenings without sacrificing education (which comes first). As it's only a 45 minute conditioning session, I've decided for the time being to do my stretching, abs workout, and push-ups in the evening in my apartment. I'm going to try for the Saturday classes at 11am, that way I can fit two workouts in a week.
I really feel guilty if I can't go twice a week - I don't believe I'd make progress as fast as I could otherwise. :(
