There are R.L. accounts of a few unfortunate subs facing nearly infinite DC engagements from escorts in situations where they made their convoy attack within reasonable round-trip range to a naval port of the enemy.
Imagine, the given number of escorts come along and send you under, ping you all over, dump their DC load all around. Then once one of them feels they are running low, they radio in, then step aside to take five, make a run to their local arsenal depot to load up, and keep tagging each other to keep bringing it on.
GWX3 is the best ever, and yes they can eventually run out of DC's. Been there, done that.