How long does deli sandwich pepperoni last in the refrigerator?

Deli sandwich pepperoni can last in the refrigerator for about 3 to 5 days after opening, provided it is stored properly in an airtight container or tightly wrapped. If it remains unopened, it can last for 2 to 3 weeks past the sell-by date. Always check for signs of spoilage, such as an off smell or slimy texture, before consuming. For longer storage, consider freezing it, which can extend its shelf life for several months.