As far as I know there's no real amount of tonnage required to complete a mission, it's mostly about how lucky you are finding and sinking large vessels.
Sometimes I don't sink over 10t in a patrol mission, other times I'll hit the jackpot and sink 100t.
The trick is to sink vessels in the designated area (bino in Star) for the mission to be completed.
Sometimes you'll get ordered to go to a area 'flag in Star' once you arrived to the designated area you'll get a message saying you're free to roam the seas or return to base, depending on the amount of fuel and torpedoes you have, you can stay on patrol, sink any hostile's units wherever found untill you hit bingo fuel. then you can choose to refit of go home.
I do recall getting a message at patrols end saying I needed to be more aggressive but it didn't bench me, maybe, if you don't sink many vessels over a long period of time in different patrols, you'll get pulled from active duty but I doubt you'll have problems finding enough vessels over the course of the sim-war.
After sinking 38t, refitting twice you should think of giving you're crew some RnR... And depending on the period you're in, upgrade you sub with better equipment or switch sub's altogether.
You won't get benched.
I'm not sure but I think the patrol time (departure/arrival home port) in real life was +-1.5 months (you'll probably be able to find this on this forum).
HJ
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