The typical shelf life of Velveeta cheese is four to eight weeks. This duration applies to cheese that has been opened but remains tightly sealed and stored in a refrigerator. In a freezer, Velveeta lasts for up to two months.
Velveeta is considered a "cheese food," or a processed product derived from cheese. Traditional cheese is the byproduct of a chemical and bacterial process in milk that splits proteins from water and produces curds. The processing of Velveeta builds on this process by adding certain kinds of salts. The resulting product is half-cheese and half-milk; it has a shelf life significantly longer than normal cheese.