24 engineers, 7 hours a day. Plus massages and free cafeteria food from a chef.

Ha, you're right it's a bit nonsensical if you take it completely literally.

But of course x7 means working every day of the week. So you can absolutely work 24x7 from Thursday afternoon through Tuesday morning. It just means they didn't take the weekend off.

They worked so múch, the days felt like weeks.

I suppose if mitigation fell over the weekend it might still make sense.

Perhaps the team members cycle so that the team was working on the thing without any night or weekend break. Which should be a standard thing at all times for a big project like this IMHO.

Or they offloaded to India like they do for most of their stuff.

this comment made my day