In reply to joekell:
Assuming you mean in a paper guidebook, it depends totally on where the crag is and how good the routes are. If it's a tiny chossheap with a 2 or 3 microroutes and a 2 hour walk-in in the North of Scotland it's probably never going to appear in a paper guidebook.
If it's somewhere with limited quality rock and more people, it'll just be a matter of when the next guidebook comes out... I'd guess between 5 and 10 years.
If it's somewhere isolated and you've put up loads of routes or you particularly want to publicise it but there simply isn't the audience to break even on your printing costs, you could take the Shetland approach and just write and publish your own guidebook to the area you have been devloping. Or you could create an online guide to try and encourage people.... Cue shameless-only-tenuously-on-topic plug for my Orkney supplement
https://edwardnind.wixsite.com/orcadianclimbing
Post edited at 15:13