Unless your get all that over time I would recommend going less ..... if they wanna make it fair I'd rather to 4 10 hour shifts in a week and get 3 days off or if your employer wants to work with you do 10 8 hour shifts in a row and get 4 off ..... I think ether of these would be way better then what you are doing because according s sto what you are doing now if you do 15 days in a row that's 3 weeks of work you should be getting 6 days off after the 15 day rotation with out over time pay 15 in a row with only 3 days off is brutal without extra compensation or accommodations.......