The ship has 3 watch shifts with 4 people each (sometimes more). Each watch is on duty for 4 hours every 8 hours (but that doesn't mean they do nothing the rest of the time :) ). A watch shift involves steering the ship on course when it's underway.

On top of that, you either have to scrub the deck, or clean everything inside the ship, or spend the whole day in galley slavery cooking for the whole crew. These duties rotate in a cycle. And the watch shift itself doesn't get cancelled. Today it's our turn to cook 🙈