Truth of the matter is you dont particuarlly have to sink anything when on one of those 'patrol' missions.
The deal is if you have torpedoes left after the time period has elapsed you will be sent further orders.
Then again you can sink every sampan fishing boat and merchant you see till your out of torpedoes and you STILL have to remain on station till the time has elapsed. Once that has happened you can radio in and will not recieve any more orders.
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