Five years now...
Yep, it was in August of 2005 that I placed my order with Conlan Press for Peter S. Beagle's book Writing Sarek, which would reprint the script of his Next Generation episode "Sarek" and tell the story of how it was written. Still no word when it will be available, except that it won't happen until some other long-delayed Beagle projects are released.
But that's the nature of small press projects, I suppose. Except for all of the ones I've bought that were published in a lot less than five years after sending in the money.