I personally dont refit because loading is a bitch and I'd rather start my next patrol out of port....
I end patrol when either
1) Im running low on fuel
2) Im out of munitions
3) I've taken enough damage that im still floating but the next hit might be my last
4) I've finished 3 or 4 missions and I still have maybe 2-4 torps left and a couple shells of deck gun ammo so I just mosey my way home and usually find a target to empty them on a long the way.
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