I start well eating chunky females at 17 months and 1200+ grams.
I've gotten numerous clutches from females that start breeding around 17-18 months old, they typically drop eggs around the 23rd or 24 month for me.
I seriously prefer larger females, but I don't wait just for a few hundred grams, especially when they almost always eat up to 1500 grams before growing follicles anyways.