OldnurseRN 165 Posts Specializes in ED, Med-Surg, Psych, Oncology, Hospice. Has 30 years experience. Oct 26, 2009 When I worked as a psych nurse at the State Mental institution we were subjected to mandatory overtime to cover the following shift for a nurse who called in. There was an actual rotation roster for this and you could refuse 5 times only. Neveer worked a place where so many people called in sick.