Totally depends on the rotation. When I did peds it was outpatient clinic only and the attending only had office hours 4 days a week so I worked a 32 plus my clinic and didactice hours. The off day I caught up on signing charts and finishing discharge summaries if my previous month was hosptialist.
Hospitalist could run 50 -70 hours a week depending on the patient load, amt of admits, dicharges and the times the attending wanted to round. We sometimes covered the inpatients of 7 different attendings and they all wanted us to round with them if possible so that could mean not getting home until 8pm some days.
Our ER rotation was 12 hour shifts, Radiology was 8 hour shifts.
Varies month to month and how much call you are scheduled.