First- it's your schedule not there's.
I give milk once per day after lunch when we are reading stories right before nap. I do this for a few reasons: I don't want kids to fill up on milk or replace food with milk so they get it after the meal, kids drink far too much milk usually, more then is recommended by pediatricians (16-20 oz per day), it is a nice routine and gets them sleepy for bed.
Sometimes when I have a new little one I will give them a little milk between morning snack and lunch to help tide them over but this is very short term.