The thing I don't get about these stories: don't you have a contract specifying working hours? My contract says 8 hours a day, for x$ per month, this is what we agreed to and this is what I deliver. Asking me to do 12h instead of 8h would be the same as paying me 66% of my salary at the end of the month instead of 100%. That's a blatant breaking of our contract, why would I agree to that?