Good thing they didn't stack the costs of individual components when you bought the bike.....I went back and looked at the receipt I received and I think I was charged for 5 hours. I suspect that this is a "book rate" thing where BMW says it takes a certain number of hours to do the 6k service and additional time for the annual even though some of the tasks can be done concurrently. I'll ask for clarification when I go back on Saturday to get the air filter replaced. It was out of stock but the labor charge was included by the service computer.
I appreciate you have no service options at this point and their business model is their own compared to my shop, but for reference my 6,000 service with doing valve adjustments was just over $400.00, so you are being charged double by adding an air filter, easy to do brake fluid flush and transmission oil refresh. I'd have to accept it if in the same circumstances, but it's like acknowledging while they come from the same source I know the taste left in my mouth if I'm served B.S. with my requested steak. Good luck.