Pay for 12 hours shift

A lot of that will depend on what province you're working in and the collective agreement in place. In Manitoba, a 12 hour shift is 11.625 hours of paid time. There are three 20 minute paid breaks and a 37.5 minute unpaid break in each shift. In Alberta, a 12 hour shift might be 11.08 hours, 11.5 hours or 11.63 hours of paid time, depending on which hospital you work at. Where I work, the breaks are two 30 minute paid breaks and a 37.5 minute unpaid break. There isn't a "premium" for the last four hours of the shift because the contract will have a clause that covers the extended shift details such that overtime would only be paid in the event of working past the end of the scheduled 12 hours, or working through your breaks. In calculating hours worked they look at the number of hours actually worked over the course of a full rotation. In some places that's 4 weeks, in others it's six and in some places it might be as many as 12. In the space of 7 calendar days a person might work five 12 hour shifts, but then the following 7 calendar days they might not work at all. Does that help, or only make it more confusing?

Thank you so much for giving me a concrete answer. I am in Toronto.

I'm not overly familiar with the collective agreements in place in Ontario. If your facility is a union one, there will have to be a copy of the CA somewhere in the building for you to look at. If you work at a non-union facility but you're considering taking a position in a unionized facility then you should find out which union and get a copy of their CA to look at. That'll help you figure it out.

Thanks