I sent five lenses Nov. 28 and got four of them back on Dec. 20 -- Leica NJ didn't have the bayonet for one of them, a 50mm Summilux, and so that will be delayed. Overall, three weeks to turn around.
This also apparently answers the questions of some people who wondered whether they were removing each bayonet, milling it, painting it, and putting it back, and the answer to that is apparently 'no.' You get a new bayonet.
I should note that I sent my lenses in by registered mail, which is the safest way, but also takes a bit longer that other types of mail. So though I sent them on Nov. 28, they may not have gotten there (probably didn't) until Dec. 4. If you overnight them, you may be able to cut most of a week off the process.
The lens work IS done in NJ. The camera fixes are done in Solms.
JC