The turnaround was much slower (6/8 months) but that is a common time frame in that part of the trade from what I can gather.
When I had Cliff La Bounty do a rebore for me about 10 years ago it took about 18 months so things are getting better.
From what I can gather, a lot depends upon just how many similar-size jobs he has waiting. Machine re-setup is time consuming and AFAIK most reborers have waited until they had enough jobs of a certain size to make the lost time economical. For instance I used to use Bob Snapp and have always been super-satisfied with the results, but if I sent him more than one size job it always took a lot longer. 3 or 4 rifles all to the same bore size took less than a year but the same 3 or 4 rifles to 2 different bore sizes always took a lot longer.
Regards, Joe