https://phys.org/news/2018-08-tesla-musk-fresh.html > Musk opened up to the newspaper about the personal toll he says he has endured, working marathon hours trying to ensure that deadlines are met, with Tesla ramping up production of its crucial Model 3 sedan. > "There were times when I didn't leave the factory for three or four days—days when I didn't go outside," Musk said.