I have four Lie-Nielsen dovetail saws and my favorite is one of their progressive tooth dovetail saws. I noticed the other day that the saw was binding and in examining the teeth closely, I realized that the teeth were worn on both sides (so there wasn't much "set" left). I contacted LN to see if they would sharpen a progressive for the standard $25 sharpening charge - they said they would.
So I mailed my saw off to them priority mail and it arrived at their place on Monday, March 19th. Today, Tuesday, March 20, I got a message that they had shipped the saw back to me. Essentially one day to sharpen the saw. I expect they have a machine to sharpen the saws, but I still consider that to be a very quick turnaround.
I'll be interested to see how it does when I receive it.
Mike
[And just for information, when you ship a saw to LN for sharpening, you pay to ship it to them, but they pay to ship it back to you.]