I have 465 or something. As to what that means, it's not real hard to figure out.
If you hit your cap in a rolling 24 hour period, they throttle your ass for the next 24 hours. 
If customer service didn't suck donkey balls they could tell you, but they don't know themselves. I got to T3 tech support once and they still didn't have internet access. Couldn't even check to see if I was connected for themselves. It sucked too, I nearly made it to the vip tech support. The guy sent it to the engineering department first and they finally realized what I told them from the start and turned the NOC side firewall back off so I could send and recieve secure connections again. One of these days, I hope to see if their top level support staff can operate their own system...
Sole Soul, when I think about using bit torrent to get something that big, I plan for weeks use too. It's all in the medium...