Hello Jeanette It was very nice to meet you and as you know, my name is Chris and today I came to do your service call for bald faced hornets. After meeting you, I explained all about them and then I went ahead and treated the nest which had about 20 of them in it, I waited a few minutes and then I removed the nest 100% and treated the area around the nest so as they return not finding their nest, they will be a little agitated and they will land trying to rebuild their nest and as they do that, they’ll pick up the material that I applied onto themselves and it will ultimately eliminate them. Please allow at least eight hours, but theoretically by say 8 PM tonight they will all be deceased. If you have any questions or concerns, please feel free to contact us and thank you for choosing Green pest solutions as your pest control provider. Have a great day.