Why Elon Musk called all-hands meeting at 1 AM on a Sunday (and what it says about him)

There's hard core, and then there's Elon Musk. 

Musk called an all-hands meeting at his SpaceX spacecraft factory in Boca Chica Beach, Texas — at 1 a.m.>Read more about electric vehicles from CNBC Pro

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"First of all, when Elon says something, you have to pause and not immediately blurt out, 'Well, that's impossible,' or, 'There's no way we're going to do that. I don't know how.' So you zip it, and you think about it, and you find ways to get that done," Shotwell said.

Max Hodak, CEO at Neuralink, where Musk is leading efforts to build a machine-brain interface to connect humans with computers, has had a similar experience.

"Elon has this incredible optimism, where he will pierce through these imagined constraints and show you that really a lot more is possible that you really think is today," Hodak said in 2019 at the California Academy of Sciences.

In a Tweet recruiting talent to work for his companies, Musk himself acknowledged he can be hard to work for.

"There are way easier places to work, but nobody ever changed the world on 40 hours a week," Musk tweeted.

"But if you love what you do, it (mostly) doesn't feel like work," he added. 

TWEET: But if you love what you do, it (mostly) doesn't feel like work

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