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Keep feeding it until it is gone. You can either just keep feeding it straight until it is gone and offer oyster shell on the side if the egg shells are thin. If the egg shells are thick enough, the oyster shells are not required but it does not hurt to offer them. Or you can mix it about half and half with the Layer, again offering oyster shell on the side if the egg shells are thin. Don't be surprised if they prefer one over the other. Mine will eat the Layer pellets and leave the Starter/Grower crumbles behind so I mix the layer and Starter/Grower and don't refill until they have cleaned their plate.
It is not an exact science. Some will start laying while others will be weeks away from laying. Some will process calcium better than others. They may be getting enough calcium from the grit if you live in limestone country and they free range, or if they eat enough hard shelled bugs. Some veggies and plants have calcium in them.
If for some reason you are feeding medicated chick feed, check the label, find out what the "medicated" actually is, and check to see if the eggs are safe.