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

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. https://www.youtube.com/watch?v=zX7I_Rw8Q0I&#t=4m54 https://www.youtube.com/watch?v=zX7I_Rw8Q0I&#t=4m54 Also, there are a few interviews where he says that [sometimes] he works that much despite being incredible painful.