"Farm time" or "mountain time." Well, usually we use "(name of rural town) time," but for the sake of this thread, I'll call it farm time.
ex. "Where IS Phil? We were supposed to meet here fifteen minutes ago!" "Dude, remember, Phil runs on farm time. He could be anywhere from an hour early to an hour late from the time you gave him. Be patient."
It's a well-understood phenomenon around here; rural folks have a long way to drive to meet up with people, and tasks always seem to either pop up at the last minute or take longer than you expect when you live in the middle of nowhere. So, folks either leave their house WAY early to compensate for potential troubles; or, they show up late because a tree fell in the road, or they had to stoke a recalcitrant wood stove's fire before leaving the house, or something.
Rural-bred folks tend to understand farm time and just nod and go on as usual if you're early or late. City-bred or suburban-bred folks have a harder time with it. It's best to err on the early side of farm time with them, though you still get some odd looks.
Oh, and jokingly, "transplant." ex. "Oh, my family's from around here, but I didn't grow up in these woods. I'm a transplant." :B