We sliced up 12 apples, then dipped them into a water-lemon juice solution. They dried in the oven on warm for about 7 hours. I actually wound up turning the oven off, closing it and letting them continue to dry overnight.
Twelve apples filled all four drying racks. But when done, they went into a gallon freezer bag with lots of room to spare. The kid says that they are good. I'm going to try a second batch with sugar and cinnamon.