I don't think there is any set "schedule" for feeding a cham. So much depends on the temperature, daylength, season, how large the feeders were he last ate, etc. Chams stop eating for lots of reasons, but a healthy cham who is drinking, basking and active can easily go a week without eating much at all. We all tend to overfeed our chams (its fun to watch after all!). Remember, the relatively fat feeders we give them are probably larger meals than insects they would be getting in the wild (lots of small flying insects for example). Make sure he's drinking and acting normally (no sleeping in the daylight for example) and don't worry too much until a week has passed.