I would think 2 to 3 inches only basing that on the jakes I have seen after the hens. Seems to be like that and the jakes with longer beards seem to be older and a little smarter and don't tend to be a threat to a big Tom. Maybe it is like when you are 17 or 18 you can take on the world but ya turn 20 even know your still a kid you know you can get your butt kicked!!!!!!!