I have made a few games that we can run inside Paragon Chat that emulate COH missions. There is no combat, but folks seem to enjoy them. These run from 20-60 minutes depending on how good your COH navigations skills are. I use puzzles, clues, building signs, map directions and Contacts to set up a mish for you to run.
Ask me if you see me around and I'll see if I can set it up for you.