Yes, this is what I mean. Some of the work of those three days that you put into the mock up are time that you as a conductor would have to spend preparing, because you are having to make musical decisions in either case. It most likely wouldn't take you three days, but it's a considerable amount of time. And when you figure that in along with the amount of time for the rehearsal and recording I'm not sure c. 25 hours of labor cost for a mock up of this quality is unreasonable. Unless my math is way off (string orchestra of 60 plus conductor and studio for 30 minutes, which at your tempo would get you perhaps a rehearsal and two takes), it looks very much like a bargain.It depends on how good the orchestra is. But with a top orchestra and conductor the first reading would be already very good, only very small details would need to be rehearsed. That's if the conductor spends the necessary hours before, building in his mind an extremely strong and detailed idea of the interpretation.