He's pretty stingy. Or more precisely, he only promotes once every 5-6 months (and he often forgets and it ends up being 7-8) and I've only once or twice seen him give more than one stripe (and actually each time he has he's given them to someone who's come to our school from a school that didn't use stripes, who had been the same belt for 2+ years). I'm only a two stripe brown belt, though I think we're due for promos soon. But I'll have to go through 4 stripes, I'm certain. It's funny, I've actually never lost to a brown belt in competition, starting when I was a purple. But since our local tournaments are all brown/black divisions it doesn't really matter to me all that much when I get it.
I train 4-5x a week most weeks. I'm fighting sub only advanced no-gi absolute this weekend, that'll be an interesting test because it's the first open division I'll have competed in no-gi since I got my brown (I won my weight division advanced no-gi in the past, but the competition was a little thin, and took silver in absolute gi brown/black).