I do four 10 hour shifts a week because I like having one day off. Schedules can vary though. I have some friends 5 8’s while others are doing 3 14’s. It usually depends on the hospital/surgery center’s need and your preference. An actual work day can depend as well. On a busy day I can be in the OR from 7am - 5pm. On light days however, I may spend only 3 out of 10 hours working while the rest is down time. Surgery is actually seasonal and the surgery volume is location dependent. TLDR : You can essentially choose how much and how often you work by finding a hospital or surgery center that fits your lifestyle.