Appetites vary widely, just like with adult humans
By the time they are full-grown adults, around 18 months and up, they should be getting 2/3 to 3/4 of their diet from greens, veggies and fruit and not too much animal protein to avoid obesity and liver/kidney disease. So they might only eat about 100 crickets a week. Some of my adults really don't even bother hunting for cricks anymore. Should they be within an easy tongue flick they will get snapped up, but it's just not worth running them down when salad never moves. When I see my adults getting this fat and lazy, I take them off bugs altogether and they just get pellets and salad unless I see them losing weight and then I add the cricks and other bugs back slowly.
Whereas a hatchling might very well eat 100 cricks in a day, sized no bigger than the width between its eyes, and broken up into 3 feeding sessions.