I haven't kept up on this like I wanted to, but I did record how long the little guys and gals took to "hatch" from their crysalis, they all avaraged 1 week. Here's one that has just emerged looking a little yellow:)
We had three hatch on the thirteenth. We always let them go the day after they hatched.
This is our last friend to emerge. He developed some really bright spots pretty quickly. I pondered keeping him untill he turned red, but I thought he'd like it better if I let him go FREE. This was a fun project to do (I think I enjoyed it more than the kids:). The perplexing thing was that I ended up with more bugs than I had crysalis for:0. I guess they really do have good camoflage!