It is too hard to say how much Chameleons eat. There are too many variables.
Some are picky eaters.
Some go on hunger strikes.
Chameleons should have 4+ different incects given to eat.
Depends the size of the crickets.
Depends the size/age of the chameleon
Depends on the Chameleons health
Depends on the set up
Will you take the time to hand feed it
Will there be food cups hanging
There are many many more, its just not possible to make an even close guess I think.
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1.1 Bearded Dragons
1.2 Maroantsetra Panther Chameleons
1.0 Long Tailed Grass Lizard
500 Escaped Crickets