Meaning, if I up a hen's protein or calcium, how many days does it take to see a difference? For example, if I have eggshells that seem soft, and I add oyster shells, how many days might it take to see harder shells? Or if I feed some extra veggies or protein, when might that be reflected in the quality of the egg? I don't have any problems right now and I know it might not be so scientific, but I'm just wondering about those who may have made some observations. Thanks!