Snow machines are basically a glorified soap blower. As such, they go until they run out of fluid. No warm cycle either. They are very loud though, so keep that in mind. They tend to sound like a leaf blower. The S-200 is a 'silent' snow machine. It has the same size blower as the S-100 II, but costs more do to the silent part.
As for power draw on the hazers, its next to nothing since they are just a small air compressor, a fan, and a pump. They draw a few amps at most.