Elon Musk said 'nobody ever changed the world on 40 hours a week' - and he couldn't be more wrong

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• In advertising his companies on Twitter, Tesla and SpaceX CEO Elon Musk wrote, "There are way easier places to work, but nobody ever changed the world on 40 hours a week."
• Musk's comments, particularly about how you can't change the world working only 40 hours a week, couldn't be further from the truth.

Elon Musk is notorious for working very long hours, and getting very little sleep.

He also thinks long work hours are necessary to change the world.

In a series of tweets supporting his companies, Musk said, "There are way easier places to work, but nobody ever changed the world on 40 hours a week."

Many on Twitter were quick to point out the errors in Musk's observation:

One woman was keen to point out the example of Alexander Fleming, a scientist who changed the world by going on vacation and accidentally leaving a petri dish open near a window, leading to the discovery of penicillin.

As so many on Twitter pointed out, changing the world has little to do with the volume of hours one works, and has everything to do with the impact and quality of that work. Countless people have changed the course of history without the requisite of working more than 40 hours every week. Though studies have shown working more hours generally does lead to higher corporate positions, working more hours is also correlated with anxiety, depression, and worse sleep.

About one-third of US adults don't get enough sleep - and Musk could probably do with a little more sleep himself. Back in 2015, he said in a Reddit AMA that he sleeps "almost exactly 6 hours on average." Earlier this year, he told The New York Times that he often logs 120-hour weeks at work, and doesn't leave Tesla's factories for days at a time. He said he's needed to take Ambien just to fall asleep.

Read more: Elon Musk says grueling 120-hour work weeks are taking a toll on his health - here's what sleeping less than 7 hours a night can do to you

But studies show that sleep deprivation is ultimately harmful: It's linked to certain cancers, chronic diseases like Alzheimer's, heart disease, and can do serious damage to your immune system in general.

Of course, every person's needs are different, and Musk's schedule may work for him. But the health risks of more work and less sleep are undeniable, and it's significantly more difficult to change the world if you're sick, or dead.

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