If "Iron Coffin's" is any indicator, im guessing in the neighborhood of 35 hours, which was really stretching their undewater endurance, on the border of aphyxiation. The allies knew a uboat can only stay down so long, and ofthen they'd attack until a boat was forced so surface.
Now personnaly i LOVE a good depth charging in SH3, but i have my limits into how many consecutive real life hours ill spend playing it. For me, 5 hours or whatever is just too long.
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