Quite a few hosts rely solely on email for support (even pair, at last look, with their 100K+ domains). And even though some smaller hosts don't give true 24/7 coverage, you can come pretty darn close, even with one or two people - if that one has pc access throughout most of the day, that is. Even some hosts who go to school during the day or evening can usually provide pretty good coverage, if they're small. Of course, once you reach a certain point, it only makes sense to get another body in on the support angle. If you're lucky enough, you might be able to find someone in a different timezone to cover your sleep (sleep? what's that?) time.