The way I understand it is you will be working some days, and others you will be on call, sometimes up to 24 hours and durring that time you muct bed able to report to work with in 2 hours if they call you. It could be more time, but no less than 2 hours. If your on call you can do whatever you want... go watch a movie, shop, go to lunch, just have to be able to get to work. Then there are other days you have off that are movable days and some that are not.