Just as a data point: I just had the dealer do my 18,000 service. Prior to the service, I was quoted $950 the two times I asked. On the day of the service about two hours before completion, they called me and said it would be $850. I was happy about that until they called me after a total of 8 hours of service and said it would be $1230. WTF?!? Anyway, not knowing what others have been paying for this service I got into it with them and ultimately we agreed on an even $1000 price.
To echo what others have said, the Ducati documents do say 4.5 hours for the service, but no one seems to be able to get it done that fast. (Like I said, it took my guys 8 hours.) Anyway, after comparing my experience to that of others on this site, I guess I got a fair deal.
On another note, for two or three days following the service, there was a noticeable delay on acceleration from stop in 1st gear in the touring mode. The delay was less in sport mode, although still there. I'm confident I wasn't imagining things. Anyway, after three days, the delay went away (or at least back to pre-service performance). Other than that, I've noticed nothing different except a slight improvement in rear brake performance.