We have a fairly large bald-faced hornet nest on our front porch.
I'm guesstimating it's about eight inches in diameter (though -- ahem -- I'm not about to climb up on a ladder to measure it).
Bald-faced hornets are fearsome stingers who aggressively defend their nest... but only if disturbed.
It's fascinating to watch them add new layers as they enlarge it, though it seems like an awful lot of work for a temporary result.
We have no intention of trying to take it down since they haven't bothered anyone. The dogs are constantly in and out through the front door and under the nest, and no one has ever been stung.
Nests are abandoned by the end of the season (around November) when all the workers and drones die off, and any newly-fertilized queens burrow underground to hibernate.
So around December or so, we'll collect the nest, maybe dissect it to see what's inside.
Meanwhile, as long as we don't disturb them, the wasps pay us back by eating things like blow flies and those nasty flies that adore cow patties. I say, more power to 'em!