As stated, 9 months. Everyone on here that I have talked to recommends keeping them in no less than a pair.
I know you are passionate about your chameleons and that is awesome, but I have yet to see osmeone report that one of their females beat up the other female. I have witnessed males side head butt each other, but never my females and I am in viewing site of them often.
Everyone is always going to have varying opinions on whats best for THEIR chameleon based on what information THEY have received as well as what works for THEM. This is what works for me. i did plenty of researhc prior as I lost 2 chameleons already and wasnt prepared. I got 5 of them originally. set them up 1.1 and 1.2. Sold the 1.1 so I could focuson ont he 1.2 as they were pregnant. Had them 9 months, no issues. Live, healthy, laying great eggs (got 6 outta one female when the average is 2-4). Healthy, happy, and living large.