Depending on how tall the stalks are about 3mph tops, closer to 2.5mph. I have never run beans more than 50bpa with a F2 and I know that is a load on it.
Thanks sd-455, The beans turned out at 60bpa and I was running at 2.5 to 3 mph. The stems were a little green and forced me to stay near the 2.5 most of the time. I thought I had the machine in top condition just needed some reassurance. thanks