I agree that it is not realistic at all. I told a friend of mine who also has III and 4 about this mission and I joked about being on eternal patrol by the time it was done. If a convoy needs to be fragged that bad, send a task force of destroyers and cruisers, not a lone IX boat.
I will probably update this thread with my mission progress, since this mission appears to be a new one.
EDIT: I looked up the mission in the Mission Editor. I know it is "cheating", but I had a bad feeling about this mission. It turns out my bad feeling was justified. The primary target is a large ocean liner (troop transport?) with a coastal merchant and an Old Medium Split merchant. However, that is not the fun part. The fun part are the three J-Class destroyers, the Clemson and the Tribal escorting the thing.
