In early 2000s dad and his cousins ran three 9400s cutting beans.  Had a tandem that would hold 600 bushels, maybe a little more packed full.  They'd cut all day and put it all on the one truck, day after day.  Figured about 5 bushels per acre at 150 or so acres per day.  Truck would comfortably hold 4 binfuls and be loaded heavy so they'd each cut 1 and 1/3 binfuls all day.  Since then running 30-40' heads an hour per bin has happened several years.  Without silly stuff like unloading slowing you down you can really cover some ground.  Had some 47 bushel corn last year, some less than that in '22 and a field that went 9 bushels in '16, not even up to the back cab window on a S670.