You are listening to his complaints for way to long. Once you have acknowledged his legitimate concerns (nod your head, summarize his position so it is clear you listened) you need to tell him that you are not going to listen any longer because you have other things that must be done as well (list them--no one has 10 hours to listen!). Use a power stance when you tell him we have talked enough about this today (think Wonder Woman--hands on your hips, a good posture and look him in the eyes). He is obviously trying to get his way. Tell him up front "no" or that you need time (a month?) to think about it. A 10 hour speech is bullying!