I don't really have a time frame because I don't understand enough about how it works. One notices something and after a few more times of seeing the same thing one can't help wondering what it means and how it works.I've seen this a lot over the years of course with different roos and hens. I've seen Killay doing it with several hens since Christmas for example. But none of them have gone broody, yet. What sort of time frame do you have in mind?