The longest time I saw for a ship to sink is about 2 hours. I think that if she has not sunk within a couple of hours, she will never sink, if you don't finish her with another torpedo or the deck gun.
Maraz
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First career: VIIB U-54
Current career (Black Sea): IID U-24
GWX 2.1, U-Jagd Tools, 100% difficulty, manual targeting, DiD,
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