The one man shops like Stroh, Harton, Gallagher, etc. will take longer because they are in high demand and the only one working on a piece. Huntington has a few guys that work for him, so his times are shorter. However, the word is getting out about his quality, so his times are starting to creep up bit. He did a conversion for me a little over a year ago that took 6 months to complete.
I have had other major work done by a couple of the other guys that took over 2 years - talk about excruciating!