One year. According to relevant public information, Lombardy assorted biscuits contain less water, and the shelf life of sealed biscuits is one year. The exact date can be seen on the package. Cookies are foods made of cereal flour (and/or potato flour) with or without sugar, grease and other raw materials, and processed by flour mixing (or pulp mixing), molding, baking (or frying), and foods with cream, protein, cocoa and chocolate added between products (or on the surface or inside) before or after cooking.