How long does it take for swelling to go down after a few wasp stings? No allergies to insect stings/bites.

Wasp stings swelling. Sting reactions can normally take several days to go down but should be improving by then. It may take a week or more to resolve completely. If it is worsening or not improving then you should have it looked at. You could have developed a local skin infection at the site of the sting.