hey robyn,
i think Kaz meant 2 weeks from hatching, thats when splinting is most effective. im hoping that your chicks recover. just letting you know, your chicks are older than mine, but i had two splayages, one was just 2wks old left his splint on for 10 days, took it off this arvo, legs are perfectly fine and he is getting around really well, the other was younger, took his off 8 days, and he has also made a full recovery. i wish the same for yours. but the green chicks are a lot older, and bones and things would be more devolped. sorry i had no experience with splinting an older chick so cant really say.