Thats the way it works, usually. Lawsuits can happen, though, but I wouldn't exaggerate the risk. Also, let me be quite open: if you hire someone for 40 hours

Thats the way it works, usually. Lawsuits can happen, though, but I wouldn't exaggerate the risk. Also, let me be quite open: if you hire someone for 40 hours and expect him to work more then 40 hours, don't be surprised if some come back and sue. You broke contract.