When I started on my current business, 16 years ago, I did that kind of hours for 6/7 years without giving a fuck. It was all about making as much as I could. Now, I still enjoy working but I can work less, have some free time and make as much if not more money than I did back then. Working paid off. At one point, the greatest luxury is time. And let's face it, 80h/week is not the same if you're blue collar or white collar.