I'm just now seeing this thread

These guys started hatching in the middle of May and finished up in early June, 2017 so they could fall anywhere in between those dates. Here's the original thread of them hatching:
https://www.chameleonforums.com/threads/first-parsonii-of-the-year.157967/
As far as their growth rates... just for some perspective I keep them semi outdoors year round in an attached greenhouse. Temperatures out there during the summer months are HOT, up into the 90s and even 100 on some days.
In the winter it will be covered with snow and a heater running full blast. Since I'm so far north the average yearly temperature (with my heater running 24/7) is about 70f, so they do slow down in growth quite a bit during the fall and winter months. From Nov to about March days are in the upper 60s out there. They seem to eat plenty of food but not having them at 80 or so all year long does slow down their growth.
On the flipside they get exposure to unfiltered UV through the special acrylic panels out there. So it's kind of a trade off, I will say the parsons I'm keeping now seem much healthier and alert than when I used to keep them indoors all year.
From what I've seen they all seem to reach full adult size, although it does take a little longer. The parents to these animals aren't particularly large, I think the male is about 700g. He's over 12 years old and not as bulky as he used to be.
I know if you're lucky and live in southern CA with warm temps all year they will grow much faster

I might try something new this year and just offer up some young babies so people can grow them up how they want. Speaking of which, #1 2018 just hatched today
View attachment 208215