On todays visit, I treated the large hole where the yellow jackets were nesting with a liquid application.After about 2 to 3 days, the wasps should become lethargic, 5 to 7 days activity should die down significantly, and 10 to 14 days, the nest should be neutralized. If there is activity after 10 to 14 days, please call us back for a re treat.Thank you for choosing Green Pest Solutions!