I'd say atleast 48" if you want a whoopie like mine that adjusts from about 16"-24" bridge and then maybe 60" and up if you want a much longer bridge. The end result of my whoopie sling experience is that I will also be switching to a fixed webbing bridge. The whoopie is nice, but I dont need it anymore.I get asked a lot how much Amsteel is needed to make a whoopie. What's the average length needed in 1/4"?