Two or three days. The ingredients of sandwich sausage packed in cold storage can be kept for about 2 to 3 days, and can be eaten within 4 hours at room temperature. It is well sealed and stored in the cold storage room, and can be taken again after heating, which is not easy to cause adverse effects on physical and mental health. Sandwiches left at room temperature for too long will breed a lot of bacteria and other microorganisms.