A chicken lays one egg a day, each day the chicken will lay later, culminating in a day off. You should expect 6 eggs a week from a mature layer, but this will peter out as the bird ages.
If you mean how many eggs can a hen lay then it would be approximately anywhere from 5-15
Usually, a hen will lay an egg every day or every other day.
a month or so
2000 calories should intake every day. calorie intake is depend on height