Immediately after I've published my yesterday's post about the number of working hours I put in last year, I started to get responses that it's more important to do smart work then to do hard work. My opinion is that in theory a brain worker could indeed produce great results without putting in long hours. But in practice I've never saw anybody doing anything truly outstanding without working hard and working a lot. Whenever I hear somebody explaining to me that he wants to do something significant but that he also needs time for himself, his family, friends and his hobbies, I smell bullshit. I cannot think of a single person who did something remarkable and wouldn't be obsessed with it in the first place. And for a really driven person, the real challenge is not how to work more, but actually, how to work less, thus making his work sustainable.