I have never been there, but I was giving that very idea some thought after reading this thread. If you fired 4000 rounds during a five day class, that would work out to 800 rounds a day. If you shot for eight hours a day that would be 100 rounds and hour; certainly not a ridiculous pace, althought it is a heck of a lot of shooting. I would have to assume that all the lecture material is done on the fly, or while loading magazines, or during lunch time.
I don't think I would like a course like that, but I would like to try it first to make sure.