Your patrol/trolling area also affects the total time spent at sea. If you hit a good convoy after just a day or two in the Atlantic you could be home and expended all your torpedos in just 4 or 5 days. Generally mine average around 12-18 days, longest is 30. Around day 15 or so I'll start running low on fuel and either have to return home or be near a supply ship.
My last patrol went from Kiel -> Gibraltor and ended up with 2 torpedos left and about 5% or less fuel left when I reach the supply ship.
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