At work we have a system to see how many hours we have worked and how many hours are still left to do. At first it was during a calendar year, but for some reason, they have changed it to April-March. Don't ask me why, I don't know.
Now, during that twelve month period I, as a full-timer, have to work on average 173,3 hours a month. If I work more than that, it's overtime and they have to pay me extra. If I work less than that, tough! So far, out of the 10 months out of this period, I have had two months with overtime. All the other months have been below. In one instance even a whole week (40 hours) less than I should have worked.
Does it bother me? Well, not so much really. After all, the company still have to pay me, even if I don't work. Which is good. But, early December they cottoned on to the fact I wasn't making enough hours and from then on they made me work. And work. And work. Which resulted in 5 hours overtime for December and 7 hours undertime for January. If I want to break even at the end of March, I will need to do 50 hours overtime a month for the remaining two months! Work that isn't there, because it's the low season.