My satellite internet provider, WildBlue (South Central Power), tells you how much bandwidth you're allowed per rolling 30 days. I've got the highest package, a whopping 1.5Mbps, and I'm allowed 22 Gigs. If I exceed that, they slow my connection to a crawl (as if it wasn't already). I've only hit it once, because I forgot to turn off my Bit Torrent client while I was gone for like a week. My upload speed sucks balls, but it was on long enough for it to hit my transfer limit.