32-40 hr/wk. 8-13hr shifts depending on the location/group. time of day varies between groups. generally, there are days, nights, and swing shifts. Whether or not you get certain days off depends on your scheduling ability and is hgihly group dependent. I will tell you that there isn't much difference between weekdays weekends and holidays unless you somehow set up your schedule that way. how to recover after a night shift? sleep.
go post in the Emergency Medicine forum. you'll get more insight.