Funny.

I've had the yellow jackets at multiple locations myself lately. For 30 years, it's only been a problem in spring.
The sons of bitches are moving in any time they feel like it.
I've used a lot of bug spray, but I am going back over their chosen territorries with a lot of Simple Green soap spray, and this stays around much longer than bug sprays.
BTW, 2 cans is never enough. When you need that stuff, you
really need it. I came home from the walmart with 8 cans (after running dry) a couple days ago. And 5 Simple Greens.