A Day In The Life of Elon Musk

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 85 to 100 hours a week, and he estimates that 80% of his time at work is spent on engineering and design.

No two days are the same for Musk. He spends Mondays and Fridays at SpaceX in Los Angeles. 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 Combinatory that he usually spent about half a day working at the artificial intelligence nonprofit Open-air.

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.

... or spends time with his five young sons. Speaking about his kids in 2013, he said: "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."

To keep his work day on track, Musk forgoes most phone calls in favor of email and texts. He also prefers to use an obscure email address to prevent people from spamming his inbox.

He doesn't spend much time on meals. Musk usually takes his lunch during a meeting, and he manages to wolf it down in just five minutes.

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.

When it comes to food, one of his favorites is Diet Coke, thanks to "some infernal ingredient." Musk told Auto Bild that he had since cut back on the soda. CBS previously reported on the tech mogul's preference for French food, barbecue, and whiskey.

To stay in shape, Musk usually hits the gym about once or twice a week. 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 between his legs.