My local dealer (UK) said 1 week best 3 weeks worst case. I personally think there is way too much hysteria over this "issue" and I'm saying that as someone with a minor oil smear on mine. Dust is a complete non-issue in my book.
I was suggesting I might send mine in from curiosity only instead of a wet clean myself, purely to see what the worksheet says when it comes back
That said, the latest hysteria and "world about to end" comments on a respected blog mentioned here might make me re-evaluate that idea as unfortunately Nikon service centres might, in the short term, get swamped with perfectly amazing cameras