Let the soup cool completely and transfer it to an airtight container such as a mason jar or plastic container with a lid. Place your delicious soup in the refrigerator for up 3-4 days. If you don't think you'll be eating the soup within this time frame, it can safely be stored in your freezer for up to 6 months! Storing this Mediterranean red lentil soup properly will help keep it tasting delicious for days or even months after cooking!