Basically, what they said.
The longest shift I ever pulled was like 96 hours or something. I worked 120 to 146 hours per week at one point. It was pretty neat, they would send to a rural area with low call volume for a 24 or 36 and then pull me into the city for a 24 or 36 and then send me back to the rural area to finish the shift (or vise versa) Most places don't let their people work that many hours in a week (and with good reason). I bet you'll be really surprised to find that the company got into some trouble with IDPH (Illinois Department of Public Health) and had to close a couple of it's stations. Oddly enough, it had nothing to do with the scheduling.
Man, was I realing in the dinero...