Yeah...stopped reading at 80 hour weeks. I don't care how esteemed someone is in their industry, if they have to completely destroy their life to get there I question their judgement and don't want their advice.
Well, the best way to negate that advice is to put out your own and show that someone can achieve the same with a much lesser workload. Any other argument is simply an opinion. I certainly don't want to work 80 hours a week, even if I know that I can get a lot more done in that time. However, depending on what it is you're trying to do, putting in 80 hour weeks might be perfectly appropriate. If you want to be simply the best in the world in anything, you simply have to put in a LOT of work. I'm not saying its 80 hours or 56 hours, but yeah, if being average or good-enough is OK, then work-life balance is very achievable.