Mon Tue Fri Sat Sun Wed Thu on earlies

Then repeated on lates

Then a week of nights Monday through Sunday

Then a week off

I believe it’s changed now as they don’t like 7x12 hour night shifts in a row. Personally I preferred to deal with the “jet lag” once every 6 weeks and be done with it.

Those shifts tended to be fairly quiet with about 4-5 hours of breaks (unless something went really wrong)

You can staff a 24/7 shift with 5 people, but you really need 6 once you factor in holiday, illness, training etc.