well i cup/hand feed my chameleon, and if she want to eat she will...just offer the feeders, he/she will take out what he needs. I dont like crickets free roaming, the could hurt the chameleon...
For really young chameleons, I give them pretty much as much as they can eat within 5-10 minutes, several times a day.
As they get to be nearing 6 months or so, I feed only twice a day, 5-20 insects total
As they approach one year, its 1-10 insects a day
and from 12-16 months or so onwards I feed once to twice most days, a total of 1 - 6 insects. Depends also on gender, time of year.