Really? I've been told duo-ing is the fastest way to train, but when I play with my teams, 3:3 medium takes a little under an hour and usually yields 11K-14K. A 5:5 large takes a little over an hour, the one time we managed to get a large enough team, we earned 19K. I've been playing this way since it's more fun and challenging, and thinking the whole time that the rate is lower than for playing 2:1 Small. So in general the fastest way to train is simply to find an experienced group of 5 and do the large dungeon?