I know to offer it free-choice, but I have no idea how quickly it will be consumed, and therefore no idea if I should purchase 8 ounces of each or 10 lbs of each! I don't want to go to the store every week, but I don't want to store two years' worth, either. So how much of each will a chicken likely eat in, say, a month? (I know every chicken is different, I'm just looking for a rounded estimate.) I have four chickens, they have a dirt run, eat regular layer pellets plus well-balanced treats. Thanks in advance!