Two to three days. If you buy in large quantities, you can put it in the refrigerator for 3 days and use it up as soon as possible. In autumn and winter, it can be stored at room temperature for 1 to 2 days. If purchased in large quantities, it can be stored in the refrigerator or frozen. Therefore, the frozen storage time of Sam's multigrain bags is two to three days, and the specific time will vary depending on the storage method and environment.