Well, if it makes anyone feel better, I hunted last night from 10 PM -2:30 AM, tonight from sunset-10 PM. Didn't see a set of eyeballs either night, but got some responses in the distance. Much as I like hearing at a distance, it was almost too still the past two nights, but certainly cold. The moon sure made a difference over the snow covered fields tonight.
Will give it another try later tomorrow night, as I'm finding that the one big property I hunt doesn't seem to get any action until after 9 PM.