If you're clocking out at 5 p.m. and wondering why you haven't changed the world yet, Elon Musk has an answer: you're not working enough hours. ㅤ "There are way easier places to work, but nobody ever changed the world on 40 hours a week," Musk wrote on X in 2018. ㅤ When asked what the magic number is, he didn't hesitate. "Varies per person, but about 80 sustained, peaking above 100 at times. Pain level increases exponentially above 80." ㅤ For Musk, grueling work hours aren't just a recommendation—they're a way of life. Known for pulling all-nighters on Tesla's factory floor and reportedly sleeping in his office at X's headquarters, Musk has long preached the idea that innovation requires sacrifice.