Maybe it will help someone else trying to do this, but with my MM2-2.0, I tested that it takes about 17 revolutions to run 1 pound of grain through. I tried to maintain a constant 60 or so RPM but it's hard with a drill. I counted out 17 turns. Even if you round it up to 20 revs per pound, that's 3lbs per minute at 60 RPM. A 12 pound grain bill in 4 minutes at 60 RPM or 3 minutes at 90 RPM. Since I have a big ass hopper, I can let it run.