This soup will last several days in the fridge-- the kale holds up nicely and it can be reheated in the microwave or on the stovetop. You can also freeze this kale and mushroom soup for several months. I love freezing soups and am always grateful to have them on hand when I don't know what to eat. Thaw in the fridge or in a bit of hot water and then simmer in a pot until heated through.