Serving and Storage Recommendations: Cake is best served 30 to 90 minutes after assembly. If making in advance, keep cake loosely covered or in a cake box in the refrigerator. Let stand at room temperature for 30 to 90 minutes before serving. Store leftovers covered in the refrigerator for up to three days. For cake that has been cut into, press a piece of plastic or parchment directly to the surface of the cut side of the cake to prevent it from drying out.