If it's an Agenda for Change contract then it's a 37.5 hour week, on average. I work an 11-week pattern: most of it is two 12-hour days, two 12-hour nights then five days off. Two of the weeks that don't conform are 48-hour "relief" duties (can be any combination of shifts at a number of stations, filling in for annual leave, etc.) and one of the other weeks includes an 8-hour relief day. The days and nights are long, but the days off more than compensate, IMHO.