Hello Joe, this is CJ with Green pest solutions and I provided one time B surface. It is good for 30 days. Inspecting the exterior I was immediately greeted with yellow jackets at the front door. They’re coming in and out of a hole right up against the door. I applied a liquid treatment directly into the hole of a hive and provoked a swarm response, which confirms that the product made contact with the hive. Give this treatment five days to see it’s best results. And if you still see activity coming in and out of this area, give us a call back.