You don't really want to return home unless you run out of fuel or torpedoes. Historically, they wouldn't simply patrol for a day, and BdU would inundate them with new missions.
In the end, it is still your decision, and you could go on a pleasure cruise for all we know.
As for gameplay, the renown bonus is taken away, so there is no penalty or bonus for doing your mission
Oh, and welcome!
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The entire German garrison of Vanviken, right here in your thread! 
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