I spent 35 hours at work one time because i was on call and never got to leave after my scheduled shift, worked all afternoon and all night. When day shift came in, the manager said she had no relief for us and that they were short staffed and e could not go home. We had to work our regular shift that day too before going home. This is why it is hard to run an OR and keep staff. Nurses are, too often, treated as machines and not people.