I killed about 17 bugs which turned out to be hornets this am.
I did some searching on the internet and as a result decided to look in the tree for the nest.
BINGO ! It is about the size of a basketball - almost.
How long does it take to build a nest this size ??
Must be a matter of DAYS since I am always looking IN the trees for stuff to prune and for insect or caterpillar damage. Due to rain, I have not checked.
TIA