Length is relative I suppose (har-har).
I'm used to a 62" recurve and the Chinook I have on the way is the shortest I'll have tried with a single string.
I got the idea of training with a light bow from Jeff Kavennagh where he details that any error on the release is amplified on a light bow and so it's a great tool for honing the release, bow arm etc.
I'm new to trad archery, but I'm showing some pretty good capability with instinctive style shooting out to 30yds. I'd like to hone the fundamental skills as solidly as possible as I'd love to compete in comps, 3D and get to where I'm comfortable hunting with a single string.