It's coming from inside the house!
https://twitter.com/elonmusk/status/1067175527180513280
"No one ever changed the world at 40 hours a week"
"80 hours minimum, with peaks at 100 hours"
A 100 hour week would be 16.6 hours for 6 days and 1 day off, or 14.25 hour days with no days off
The idea that entrepreneurs need to work more than 40 hours a week to be successful is as old as our industry, and I'd go so far as to say that those casually working a schedule that looks more like a salaried position are probably "consultants" and aren't really entrepreneurs trying to build something or change something