Ok, I guess I should think about 64". I have had a few 60" bows, and all required a high amount of concentration to shoot.
One was a dream bow a 58" PSR, another a 60" zipper extreme. Bill Dunn warned me that 60" extreme was too much for my draw. He was right. He said it would be like a 31" draw on std riser bow.
I also shoot a 60" std zipper great. But its 61lbs, and I bet I am not getting to my full draw as I will a 48lb bow. Litterly no problems. Just hard to believe 2" makes that much a difference. But it does.