Question for you - how much more productive were you on your 80th hour than on your zero-th? I ask because I typically work 50 hour weeks. I've pushed to 80 when projects are wrapping up but I find that the extra hours are mostly only useful for rote work like writing/running tests, fixing simple bugs, and not for creative work. In fact most of the most difficult problems I solved in my off hours rather than at my desk. So I've always wondered what the net benefit is of working crazy hours like that in the long term, especially when there's always the option of hiring two employees and paying them 1/2 of the salary (I know I prefer x for 40/wk rather than 2x for 80/wk, the marginal cost of that 80th hour is huge!)