I guess that depends on each persons priorities no?
For one person, working hard and diving in to their work and giving 90% of their life to their work is their priority, some just like that way of life.

For others, like myself, i cant imagine doing that, i like my freedom, i like having time to myself, time for my priorities, time to actually live - at least what i call live.
I would however, not mind working and spending a lot or even most of my day if it was something of my own, something i am building, something i am passionate about.

I think its just all about priorities and the point of view, the perspective.