There are a few lexion 480 combines running in the Panhandle of Texas who have claimed over 50,000 bu_day of corn in a 15-17 hour day. The corn produced there is consistently irrigated_fertigated. Growing degree days are perfect and the yield is well over 230 bu_ac. The fields they typically harvest in are sections or 580ac circles. If you think about it, the bulk total (50,000) is large, but the avg. bu_hr isn't around 3,300 bu_hr. However, the value is consistent, I know of no other combine capable of that much consistency and capable of resulting in 50,000 bu_day