I find that my hens have differing needs on different days, depending on the weather etc. But I think they're going through about a cup each of layer pellets, plus a pan of broccoli, carrots, lettuce and "whatever" at breakfast. In any event, I leave the pellets out for them all day so they can get what they need.
On average I find my chickens eat just under 2lbs per bird a week. That number goes down significantly when they are on pasture. I let them out on pasture first thing in the morning. About and hour later I put out their food and they eat free choice all day.