I haven't really kept track of how long until they are adults, but it may be like at least 5-6 months. I just go by when their juvenile feathers have been replaced with the adult plumage. Unlike the domesticated coturnix quail, these wild quail grow slow and so it'll take a while. The ones in the wild tend to pair up around February onwards (that's when the fighting and aggression starts) and so you may have until like January to release. The real reason for releasing them when the ones in the wild covey up is so that they won't be hostile to your birds and they can teach your birds (via your birds follow where ever the wild ones go) where the food and water sources are at.Ok thanks good info! How long does it take til they are adults, would this winter be ok? I'll look it up soon...