A couple times a year. Hard to say with exact time. It occurs similar time frames to females laying the infertile eggs. It really looks like a weird pile of feces or that is the best I can describe it. As long as you hear about it ahead of time you will know it when you see it.
My jackson is doing great. I just moved into a house a week or so ago. I am setting up a chameleon room and will take some pictures once I get them situated in there permanent location.