Also a long time ago...
I was bounced around '43 by a single escort (or destroyer) near the convoy.
Very soon I had definitely 3 of them (maybe 4) above playing 'tag' with me.
No idea what they were as I play at 100%
One would sit there pinging me and the others would attack. They'd take turns. It lasted for around 8 hours
Real Time - I got to bed very late

DC count.. no idea, I stopped counting, but they were salvos of around 4 - 8 each time... I don't think they ran out of DCs.
I spent the whole time at the sonar station, tracking each ship and avoiding each attack. I suffered un-repairable scope (both) damage, so after creeping away deep and slow.. I managed to escape after around 12 hours under, to return to base.
The best experience I've had in the game.
