I had an interesting time when I lived with 3 roommates and we got a gigabit connection (this was ~5 years ago, it was a big deal). We hit 3TB/month consistently and interestingly enough, it was about 80% going to consoles. We'd play a lot of Destiny and matchmaking would always make us "host" (because we had the beefy connection)... turns out a surprising amount of data gets pushed through your connection when you're hosting 16 player games for hours a day, on three consoles.