They do seem to run out of the depth charges but the destroyers have no problem sticking around after they run out. Thats how I keep losing in the practice mission with the three destroyers that attack. I can get them to run out of charges but they keep me down and don't let me back up.
Luckily in the convoy attack I was over on the starboard side of the convoy and the two destroyers were way off on the port side, which allowed me to get in pretty easily. After my torps hit though the sonar operator reported a minute or two afterwards that the destroyers were closing fast. They definitely responded right away but since there were two of them and a somewhat deep ocean bottom I was fine.
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