I think they shoot for that sweet spot where the feed conversion ratio plateaus, at least from a commercial standpoint, to maximize profit, which I think is 8-10 months. From a practical small flock perspective, it just depends on what size you want and what breed the capon is. Some breeds can end up the size of a small turkey, but I would think that would be something like a Brahma or Giant, which would require a very long grow out, since they get their bone growth during the first year, and flesh in the second year.
I am really just curious about how he grows out over a longer period of time.
I had thought I might wait and have him for Easter.