He is being used by his workplace, that workload and that much responsibility for 60k is absolutely absurd. He has to be strong, and just leave on time. If he misses deadlines and loses accounts, that is not his problem. He can't have personal responsibility for things like that, I know it's hard but really he needs to put his foot down. Or get another job and start afresh with reasonable hours that he sticks to.
I hate to say this, but it is probably partly of his making, if his partner and subordinates aren't working at nearly the same rate as him, then he can't just blame the company. It sounds to me very much what happened to my partner, where he was taking far too much personal responsibility for his company. He's not a workaholic, he just didn't know how to say no. I had a huge hissy about it before we were even thinking about kids, and said it wasn't going to work if he couldn't find a way to get a better work/life balance. He now works 9-5:30 and the sky hasn't fallen in.
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