how long can you keep lentils in the fridge for
1 Unopened canned lentils will keep in the cupboard or cool, dry place for up to one year. 2  After opening and rinsing canned lentils, store in a covered glass or air tight container in the fridge, not in the opened can. 3  They will keep for 3-4 days. 4  Freeze cooked lentils for 1-2 months. Dried lentils that have been cooked can be kept covered in the fridge for 5-7 days or frozen for up to 6 months. 2  Label with the date and store an air tight container made for freezing food. 3  Having lentils in the freezer makes them easy to add to any meal.