I have one hen that did not molt for two years. I had to clip my pullets wings when they were young because they kept getting out of the chicken yard. The others her age molted long ago. She looked terrible with her stubby, ratty feathers for the last year or so. Finally two years later she is going through a pretty hard molt and her body looks nice as well as she is getting her wings back. As far as I know, they are all different as far as molting.