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That would be usual. (I worked on one.) It's usually 4 hours on, 4 hours off when at sea. They do safety checks 24 hrs a day, inspecting doors, hatches etc. They'd also have emergency drills with survival suits and liferafts etc. And they don't drink. Anything weird happens and they rush to the deck with their life jackets, whether on duty or not.
I wonder if they have a permanent rotating watch on ships like this?