EdW....wait.
Are you saying 60 (sixty) acres per hour? Or, do I misunderstand? If dealer gave you a minimum # of hrs, you may have a hard time meeting it?
With a 36' head.....in beans.....right?
Also, knowing your results, I'm assuming bean yields well-well above 50+.
Which model NH combine did you lease? So, are you running both machines now?