Well the long and short of it is that there are so many different ways to work the schedule that is a really difficult question to answer. I don't think there are many places in Ontario that still work 24's (not to say there isn't any). There are two common schedules that most seem to use... 2 on, 2 off, 3 on, 2 off, 2 on then 3 off with every other weekend being off. The other is to hard to explain other than it is a 28 day schedule with 7 off in row... but you have to work for it with a 6 day split in the middle.
Don't know if that helped or just confused you more... I might actually be confused now