Marc. Turnaround often hinges on how much has to be done to the parts before they hit the tank. It's not that they do not like to do disassembly and polish, but rather that they wait for a "spare moment" to get it ready for the tank.
I'll add to the chorus recommending Giacomos. Dan uses the slow blueing method. It takes longer, but you don't have to worry about side-ribs. I had them reblue one of my Perazzis, and the work was outstanding. J.G.Sayle
mflora's original post requested we consider "Quality first...". Seems to me that's what we all did.
In my experience, pricing is quoted by the gunsmith after seeing the item he is being asked to work on and can accurately estimate the time and materials it will take. As to delivery, that usually varies depending on how much work is ahead of yours.