Ditto for me, long as it takes!
I usually make use of the GWX shipping route maps and follow them looking for contacts. When I am out of torpedoes its back to base and if I encounter anything on the way and weather permitting (most of the time its not) then its bang bang with the deck gun.
Though when I get the warning diesel down to 50% I usually will allow myself a week, and then I will head back, depending on how far out I am.
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