If that's all they're eating and they're heavy weight breeds, that could be pretty close. I've always read 1/4 lb per day for a laying hen that's a light weight breed and a third more or up to 1/3 lb for a heavy weight breed.
Mine don't go through that much feed. That's just an estimate. It depends on what else they eat, whether they free range, what breed they are, whether they're laying or molting, what the temperature is or how digestible the ingredients in their feed are. Some feed recipes are more balanced, have more micro-nutrients or have better quality ingredients than others. If any one nutrient is a little lacking, they can end up eating more food to compensate.
If you think it's a little too high, you can also check to see if you have any wild birds or animals stealing feed, too.