I find that in TMO 1.9, convoy escorts give up after a couple hours. I have had some severe depth chargings where I assumed I was a dead man. But with basic evasion tactics, even in the worst conditions, I have found that eventually the escorts peel off to rejoin the convoy. Just tonight, I hit a convoy hard coming out of the Bungo strait, sinking 3 ships. It was perfectly still water, and having attacked from about 1500 yards, naturally I was detected by one of the escorts. The other two closed in, and for two hours they took turns DCing the hell out of me. I used the basic tactic of when a DD does his DC run, I change course by about 30 degrees (away from the bulk of them) and change depth by say 50 ft. I'm in a Balao, so I operate around 500 ft, going down to 600 in extreme emergencies. Anyway, they had me on sonar, and no amount of depth would make them lose me. I just had to wait it out, dodge the ashcans, and eventually, miraculously, they all decided to blaze back in the direction of the convoy. I got away with light damage to the stern tubes. I've had this experience before...if you try to outlast them, they will eventually leave...
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