Hi, I save most of my gingerbread projects for months (some for years), just using my normal cutout gingerbread cookie recipe. But the cookie and icing will eventually dry out, and weird things can happen. For instance, the icing can "sheet" off (slide off in big sheets). So if you're storing pieces with vertical iced cookie parts, it's important to store them on something soft that can "break" the fall of any icing pieces. Usually sheeting can be repaired by gluing the icing sheets back on the cookies, as long as they haven't broken. But, if you're just storing until Christmas, it's doubtful you'd experience this problem.