You can store a Duncan Hines cake for up to three to five days at room temperature. If the cake contains a frosting or filling requiring refrigeration, store it in the refrigerator.
Unfrosted Duncan Hines cakes can be stored at room temperature for up to five days, and cakes covered in fondant can be stored at room temperature for up to three days. Refrigerate any cake that needs to be kept longer than the recommended number of days.
An unfrosted Duncan Hines cake can be stored in the freezer for up to six weeks before it is frosted or eaten. Wrap the unfrosted cake before placing it in the freezer, and when it's time to thaw the cake out, unwrap it and set it out at room temperature. Frost the cake after it has thawed enough to reach room temperature.
A fondant cake that has been refrigerated may form condensation when it is taken out of the refrigerator. Any dried decorations on the cake may become soggy, but the appearance of the cake should improve as the condensation eventually evaporates. The cake’s appearance may be flawed if the decorations contain contrasting colors or if the fondant is touched before it has completely dried.