[sublynx]

2-3 hours, IIRC. I managed to lose all but one of the escorts and then the last one chasing me hit me once and got the electrical engines knocked out. For the next 15 minutes I was slowly sinking, dead-in-water, making emergency repairs, while controlling depth by blowing ballast and praying not to get hit again. The escort was running low on depth charges and only threw a couple of dc's at me or the Bold canister I had released when hit. I was not hit again and had no problems in losing the last escort after I got my electrical engines working again.

That was a 1942 experience against a convoy guarded by just 4-5 escorts. I'm not too hopeful to survive against the late war NYGM convoys. I remember someone writing that the numbers are closer to the historically realistic numbers which could mean 8 at close escort and a force making long range probes.