This part of the article is about shifts for assembly workers:

So Musk is making the machine to make the machine. Musk has brought lessons learned from Tesla’s assembly line so workers do not burn out. They will work three 12-hour days and then have a four-day weekend. Then they’ll work four 12-hour shifts with a three-day weekend. Thus, with four shifts, the Boca Chica site can operate at full capacity 24 hours a day, seven days a week. SpaceX is throwing in hot meals every three to four hours, for free.

Or he doesn't care about burnout. Because of the branding of how cool space is, and robotic missions that actually advance the science not being as sexy, he has a fresh supply of excited people (rant about the science vs the sensation). Knowing former SpaceX employees informs that.

I think that schedule actually sounds pretty great. I mean, it wouldn't work in my life now because I have kids and a dog and whatnot, but in my 20s? I'd have done 36-72-72-36 in a heartbeat. Imagine always looking forward to a three or four day weekend!

I'm happy with my 9-to-5 schedule now -- I can stop work at a specific time, and mostly stop worrying. Mostly. But it's not the same kind of freedom as knowing that the weekend has started, and that there is a multi-day period where you can start forgetting about that whole world (barring emergencies, of course).

Rotating between three and FOUR-day weekends? Wow.