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One of the world's [most / mostly] successful business leaders, Elon Musk, has said that people need to work from around 80 to [overly / over] 100 hours per week to "change the world". Mr Musk knows what he is talking about because he has his [tongue / finger] in many pies. He is the founder, CEO and [lead / iron] designer of SpaceX; the co-founder and CEO of the car company Tesla; and the co-founder of PayPal. He works very [hardly / hard] on many projects that have changed and could change our lives. He said he is a [workaholic / chocoholic] but he loves what he [works / does] . He talked about working hard in an [interview / interviewer] with the technology news website Recode. He said: "There are [way / wait] easier places to work, but nobody ever changed the world [in / on] 40 hours a week."

It is not just Mr Musk who [workers / works] hard. Workers at his companies also put in very long hours. Musk said "everyone" at Tesla has worked 100 hours per week [that / at] times this year. He said this was necessary to make [sure / surely] the Tesla Model 3 car could [survival / survive] . He said: "There wasn't some other way to [do / be] this." Musk acknowledged that some Tesla employees were [unhappily / unhappy] with working so hard. He said some workers called the hours "excessive," while [other / others] said they prefer to work 70 or more hours per week. Musk said the "[plain / pain] level" of working hard increases above 80 hours a week, but he didn't say what the pain was. The [averaged / average] CEO of a multi-billion-dollar company works [around / abound] 70 hours a week.