I think the amount of feed varies depending on where you live.
Mine get 3-4 cups of feed at least once a day thrown on the ground and it is gone in 2-3 minutes. If they forge all day, then they get fed once in the late afternoon to get them back in the correct pens at the time I want to put them up. If they don't get let out that day, then they get fed the 3-4 cups twice a day. I 50# bag of laying pellets lasts about 4-5 weeks. About once a week I throw a handful of cracked corn in the pen with the pellets and about twice a week I throw a handful of sunflower seed in. Those 2 bags last a really long time (don't even remember when I bought them last). Out of my 8 hens (also have 3 roosters), I got 3-4 eggs a day in January and now that the days are getting longer and it has been really warm, I am getting 5-6 eggs a day.
We don't have much of a winter here, so they get plenty to eat foraging. I also have not needed to use any oyster shells and they have really hard egg shells.
I suspect this summer, I can get by with a little less feed.