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THat's not one of the recommendations he gives. That's not even part of the email itself.

Perhaps not in this letter, but it sounds exactly like that in this video:

>If somebody else is working 50 hours and you are working 100. You get twice as done - as much done, in the course of a year as the other company.

Also, there are a few interviews where he says that [sometimes] he works that much despite being incredible painful.