it depends what "work" is, if you have to do hard physical work i don't think you will find too many people doing extra hours, also employers would not demand it as they know there is a limit, i think the further you get from this definition the more hours people think they should put in and the more employers expect it, it is ridiculous in a way because with labour saving technology that we have had for 30 years now people should have very little work to do, its just that society has not caught up with technology, an awful lot of modern "work" is not really that essential