We spray ours for about 2 minutes straight at least twice a day. It's hard to keep the high humidity because of the cage being mesh. Having a live potted plant helps to hold the humidity. Also you can put an ice cube on the cage over a leaf so the water melts and drips down to the leaves.
He needs UVB light in the day and a heat lamp basking area. Also, he needs to be misted or have a slow drip onto the leaves because they do not drink from a dish.
There seems to be mixed information on this. I was under the impression that only veiled chameleons lay eggs without breeding. I have come across a few posts that say all female chameleons do this. My female is a senegal.