Six years in the 1990's for the upper rifle, a Model 74 Sharps from C. Sharps Arms in Big Timber, MT. They told me it would be about two years, I paid up front in full. In the end, though, it proved to be a match winner at our local 1,000 yard matches. Chambered in .45-2.6" (aka .45-100), just enough more poop over the .45-70 to make a difference. Still one of my favorites.
The bottom rifle took two years to get from Shilo Sharps, also in Big Timber. This was four or five years ago. They told me that up front. Paid in full upon order as well. This one is a hunting rifle in .45-2.4" (aka .45-90).
I understand both companies are now delivering in a year or less.