Earlier quoted context omitted.
It's pretty well documented that people at SpaceX work 80+ hours a week consistently: https://www.quora.com/How-many-hours-a-week-does-a-typical-S... http://spacenews.com/op-ed-3-things-to-know-if-you-want-to-w... https://www.reddit.com/r/spacex/comments/25ixxq/is_spacex_wo...
Not only that, it's also not really a secret that SpaceX attracts people who want to enter the space industry. You get experience there, you move on. Yes, they have experienced people too, but overall, turnover is high for a reason: https://hackerlife.co/blog/tech-employees-turnover/Los-Angel...
Which is exactly the kind of people that SpaceX does not want and who should not apply there. The turnover is high for a reason indeed.