That'll last 1 bird months... my 15 birds eat #50 in 2-3 weeks.....by that time it will be stale and the nutrition in it will degrade. I suggest you return it....unless I am incorrect about you having only 1 hen and 1 chick.plus two fifty pound bags of chicken feed for our full-grown laying hen.
But first... what's in the chick starter, protein and calcium percentages on tag sewn into bottom of bag? How big are starter bags?
A lot of us feed starter/grower/all flock types feed and provide oyster shell on the side for the layers in the flock.
Cute story.