Some people would gladly work 7 days a week if they could. I think the best thing for ones career is to love it. The people who love being at work, idk, some may see that as a negative, but I think its great to have. When one finds work enjoyable, can't beat that combo. But obviously this isn't the case for most who can't wait until 4 or 5pm, and this is right when they get to work.
A couple of people I know who work at Fortune 500's would love more overtime, but companies aren't giving enough of it.