How long does it take to get the milk from the cow to the grocery store shelves?

On an average day, a cow eats 4 kg of hay (about the size of a small microwave), 16 kg of silage (about half of a child’s backyard swimming pool), 10 kg of mixed grains, salt, vitamins and minerals (2½ ice cream pails full) and 60 litres of water (2/3 of a standard bathtub).