Depends. We're on a rotation, but there's only two people on the "off" shifts at any given time.
More often than not, I'm 8AM-5PM. I want to say it's an eight-week rotation, and during that eight weeks, I'll spend one week at 6AM-3PM, and another at 10AM-7PM (next week, for example). The week I'm 10-7 I'm also on call for my department, so I usually end up putting in more time for after-hours calls. The plus side is because I'm "working" on the weekend when I'm on-call, I get the following Thursday-Friday off to make up for the Saturday-Sunday I worked the week before. So every eight weeks I get a free four-day weekend, regardless of holiday (and if there's a holiday in that same period, I get that day off, too).
All shifts are Monday through Friday, one hour lunch.