I have just over 9k miles, and my car has asked for oil twice now.
The first was a few months ago, after I just picked up a friend and was getting ready (thankfully) to go for a drive (I'd had a pretty mellow drive up to that point). The second was the other day as I was leaving work.
I've never seen any evidence of leaking. I drive reasonably hard from time to time, but not abusively so. It's mostly having fun when I'm first in light at a stop light, or when my daughter says "go fast, Daddy!" going up the hill on the way to her school.
Fortunately, I bought 2 quarts the first time & left the 2nd in my trunk, but now I'm starting to wonder if I shouldn't just always have a quart with me.
What have your experiences been? At what point should I be concerned?