About a year. Fresh Gorgon Cake will evaporate water and change color at room temperature. It can be stored for up to two days. However, after freezing, the water can be locked in until it is thawed. It can be stored frozen for about a year. Gorgon cake is a soft traditional pastry that was first made by residents of Xitang Ancient Town, Jiashan, Zhejiang and has been passed down to this day.