I'm guessing of course but I would say a dozen. Mostly in West Central and South Western Minnesota. This is over a course of many years though. Early on growing up, I did much of it in 1 or 2 counties around the Northfield area, where my grandfather got me hooked.
I grew up hunting pheasants in MN. Been a while. Without trying to figure it out on map. Lots of counties come to think of it, including as far North as Hubbard County and down on the Iowa and SD borders. I bet at least 20.