My butt has been on the K46 seat for 10 hours in Arkansas, and then on the K67 seat 8 hours in Arkansas mountains. Its all about what you are doing. If you are just sitting upright straight, your butt is going to get tired. If you are riding the bike like it is designed in the twisties, it is nothing you will notice in your butt because you are going to have smiles for miles.
Went to the dealer today and paid for the bike. It's a January 2020 build. They said they are coming in regularly now. They have 6 more inbound next week. This week they got 5 in. I'm sure all dealers will be getting there bikes in like this as well.
I should have my bike sometime next week. Wasn't ready to take delivery yet.
If the seat becomes a problem I'll get a comfort seat or the one from the non M bike.