If you count on-call hours, I've worked from 8-4:30 Friday... followed by 60 hours of on-call over the weekend.... followed by 8-4:30 Monday. That's like 70+ hours. It was horrible.
We do half-weekend on-call hours now, which is so much more reasonable. This weekend, I'll be on the clock from Midnight Saturday until 8 a.m. Monday, then will go in and work my regular 8 hour shift on Monday: 40 hours.