Bake the cookies until dry and crisp throughout, about 1½ hours. Transfer the pans to wire racks and let the cookies cool to room temperature, about 15 minutes.
To Make Ahead: Cookies can be held at room temperature in an airtight container for up to 5 days or in the freezer for up to 1 month. If stored meringues are chewy, bake at 200°F for about 10 minutes to restore their original crisp texture.