When all is said and done, Musk usually doesn't crash until 1 a.m. That late bedtime isn't too surprising for a man who's busy trying to do things like revolutionize the way we drive and send humans to Mars.
Musk may be a bookworm, but that doesn't mean he can't party. The entrepreneur's legendary bashes have included a birthday party at an English castle that turned into a big game of hide and seek, and inviting a knife-thrower to pop balloons that he held in between his legs.
Despite his busy life, he also carves out enough time to read. Some of his favorite titles include fantasy classic 'The Lord of the Rings,' biographies of innovators like Benjamin Franklin and Albert Einstein, and an obscure 87-year-old history book on famous adventurers called "Twelve Against the Gods."
To stay in shape, Musk usually hits the gym about once or twice a week.
When it comes to food, one of his favorites is Diet Coke, thanks to "some infernal ingredient." Musk told Auto Bild that he's since cut back on the soda. CBS previously reported on the tech mogul's preference for French food, barbecue, and whiskey.
He ends up getting most of his calories later in the day. "Business dinners are probably where I eat way too much," he told Auto Bild.
He doesn't spend much time on meals. Musk usually takes his lunch during a meeting, and manages to wolf it down in just five minutes.
To keep his work day on track, Musk forgoes most phone calls. He also prefers to use an obscure email address to prevent people from spamming his inbox.
Multitasking is a crucial part of Musk's strategy — as is working for as many hours as possible.
... or spends time with his five young sons. Speaking about his kids in 2013, he says, "What I find is I'm able to be with them and still be on email. I can be with them and still be working at the same time ... If I didn't, I wouldn't be able to get my job done."
On the weekends, it's more of a toss-up. Sundays are usually spent traveling or staying at his Bel Air mansion. On Saturday, he either works at SpaceX...
No two days are the same for Musk. He spends Mondays and Fridays at SpaceX in LA. On Tuesdays, Wednesdays, and Thursdays, he heads to the Bay Area to work at Tesla. Quartz estimates that he spends an average of 42 hours a week working at Tesla, and 40 hours a week working at SpaceX. He also told Y Combinator that he usually spends about half a day working at artificial intelligence non-profit OpenAI.
Once he's up, Musk launches into a blistering schedule that breaks his time into a series of five-minute slots. The entrepreneur has been known to work from 85 to 100 hours a week, and he estimates that 80% of his time at work is spent on engineering and design.
One thing he always makes time for, no matter what? Showering. He once told Reddit that it was his most important daily habit.
Musk usually skips breakfast. Occasionally, he will slow down long enough to grab a quick coffee and an omelette.
Musk kicks off his day bright and early, rising around 7 a.m. In a Reddit AMA, he said that he usually gets six hours of shut-eye.