Well if you get 80% of your line speed, like I get with my 512, you'd be able to download aprox 1.69GB a day so that gives you 11.81GB in a week.
Here's how i got to that answer: 192 / 8 = 24KBps / 80% = 19.2KBps rounded to 20KBps for simplicity. Then 20KBps * 60sec = 1200KB per min * 60 = 72000KB per hour * 24 = 1728000KB per day / 1024 = 1687.5MB per day.