I worked at a freightliner service facility as a forman ( open 24/7) and we were on 4 off 4 12hr shifts. it was kinda cool. worked out that when you took your vacation you were off 12 days straight due to the rotation

Once when the guy who worked opposite of me had surgery I worked 32 days straight @ 12 hrs a day. Made lots o overtime too. They didnt make me , they asked if I wanted to or they could get a fill in. Im kinda greedy so I took it