Spread the pineapple slices on the baking sheets. Bake for about 2 hours, depending on their thickness,
until the edge of the pineapple begins to dry. With a thin spatula, turn the pineapple slices over 3 to 4 times during the drying process. Be careful not to overcook them, as they might get too brown. The pineapple must still be pliable.