one dude said about 15 mb per hour, one said 4 per match...If you think about it, all maps, 3d renderings are ran locally off your disc, only data saying to make what move where is transmitted. Totally different from streaming actual video. I guess the best example would be two people playing chess over the phone. You tell the other person where you moved, and they tell you where they moved. You can't see each others boards, but you have two sets of pieces and can play the game to its full capacity.
