Without sounding too harsh, nobody can be forced to work 70 hrs a week without suitable rest time afterwards. There's a thing called employment law that dictates how much time is allowed to be worked. I assume your friend signed a contract when they joined this company? If not, Mmmmm, well I'd say they don't have a leg to stand on if it came to seeking compensation or anything like that...... Sorry to be so negative in my reply but it sounds to me like your friend agreed to this and is now suffering as a consequence.