Work over 80 hours a week to change the world

My students in my high level lessons studied this week how one of the world's most successful business leaders, Elon Musk, has said that people need to work from around 80 to over 100 hours per week to "change the world". Mr Musk knows what he is talking about because he has his finger in many pies. He is the founder, CEO and lead designer of SpaceX; the co-founder and CEO of the car company Tesla; and the co-founder of PayPal. He works very hard on many projects that have changed and could change our lives.