Disable P2P and the download will be faster 
Doesnt take that long these days, all new DVD's are patched to WoTLK, so once you install just a 1.6GB patch to get you up to speed and have Outlands and Northrend all there. Started installing at 21:30 last night and was in game by 23:30

You're probably best off driving to the shop and buying it rather than downloading it. Will probably be quicker.
Be prepared to wait HOURS for it to install though.
Doesnt take that long these days, all new DVD's are patched to WoTLK, so once you install just a 1.6GB patch to get you up to speed and have Outlands and Northrend all there. Started installing at 21:30 last night and was in game by 23:30