I'm not so sure. I've seen particularly the Chinese have real issue that's not rote drone-like work. In the research department I've seen chinese exchange students perform back to back tests for 10-12 hours per day like a machine. However, if you'd ask them why and what they're testing you'd find out that most of them are effectively just shotgunning until they find something that is different.

Having a good work life balance keeps your mind fresh, allows you to think more thoroughly and more creatively. Doing the right work will beat doing all the work until by accident you did the right work every date of the week.