I look at it like this:
When you're working for a company, no it's not worth making such a huge time investment into your career. Life is too short, you're supposed to work in order to enjoy it. But not spend all your time working and have no chance to enjoy it. However...
If you're starting your own business, you may very well need to put in a lot of hours, but the intent of that should be so that late you dont have to, or maybe not even work at all.