As stated above, patrols were usually more than a month and less than two months. Obviously, if you had good hunting and ran out of torps early you would come home much sooner. I try to make mine not last more than about 7 weeks even if I still have fuel/torps.
Regarding reloading and going back out, in the Asiatic fleet later on in the war (when they had more advanced bases) they would sometimes do "double-barreled" patrols where they would return to a forward base after expending their torps, reload, and go back out for another run. I don't know of any instances where this reload happened more than once.
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