Well, if we are talking about SHIV/USN then I think after few months of war the somehow regular rotation system was introduced. I think at least for a while 1/3 of the crew was replaced after the patrol and replaced men were then ordered to be in service in the base, they got some free time and finally they got an order to report on board of some another boat. E. Beach is telling something about the system in one of his books. Even the story is just fiction, Beach served on board of USN boat as an officer so I think the information is quite accurate.
In German navy there wasn't equal system.
Greetings,
-RC-
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