How many days do you work?

Our normal schedule is 48 hours on shift with 96 hours off. This translates to a 56 hour work week. However when somebody gets sick or takes time off, it is up to us to fill their spot which can quickly add up to 72 or 96 hours worked in one week. There are three shifts, A, B, and C. Each working this schedule so there is always somebody on shift, 24 hours a day, 365 days a year.