Well I have two PRN jobs. One at a LTC/Rehab facility and one at a hospital. At the LTC facility I have to work 3 days within 3 months so, basically one shift a month. If not, you'll get taken off payroll. For the hospital, you have to work 2 shifts a month either 8 hours or 12 hours. I really like PRN. At both places I work you can create your schedule, so if you're in nursing school it helps out a lot.