If you are dipping orange slices, dip them into the melted chocolate and then set on a parchment or wax paper lined tray. When all of the fruit is dipped, place the tray in the refrigerator for 15-20 minutes. Once the chocolate has hardened, transfer the oranges to an airtight container and refrigerate until ready to eat. They will keep this way for at least 2 days. Beyond that, I wouldn't know, because I haven't managed to make them last that long. Enjoy!