Successful Elon Musk has said that people must work from 80 to 100 hours per to "change the world". Mr Musk knows. He has his finger in many . He is the , CEO and lead designer of SpaceX; the co-founder of the car company Tesla; and the co-founder of PayPal. He works very on many projects that have changed our . He is a but he loves what he does. He talked about hard work in an with a technology website. He said: "There are easier places to work, but ever changed the world on 40 hours a week."
Workers at Mr Musk's companies also put in long hours. He said "" at Tesla has worked 100 hours per week at this year. This was to make a Tesla car could survive. He said: "There wasn't some other way to do this." Musk said some Tesla were unhappy with long hours. Some called the hours "". Others said they prefer to work 70 or more hours per week. Musk said the "pain level" increases above 80 hours a week, but he didn't say what the was. The average CEO of a multi-billion-dollar works about 70 a week.