What do you need to start doing to be able to work 10-12 hours a day?

What do you need to start doing to be able to work 10-12 hours a day?

There is a desire to work at least 3 times a week not 8, but from 10 hours a day, as well as spend at least 4 hours on work on weekends. Problem: after the usual eight I run into fatigue (although the desire to work). Are there ways to increase your productivity and start working harder (as long...

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