I am new to raising chickens so please forgive my ignorance. I purchased 4 hens that were about 3-4 months old. I bought them about a month ago. My question is how do I know when they are full grown? I purchased them strictly for eggs so when should they start laying? I live in north Florida so the tempature has been mild, we have had a few cold snaps but looks like warmer weather coming. Thanks in advance for all your comments and suggestion.