I'm not sure as I don't know why when I use a Window PC to download after 12am I can't even read 32kB/s so get around 300MB to 500MB maximum/per night.and Just bought an Apple Mac and downloading speed is quite different i usually get 150KBs to 180KBs so get around 3,5GB to 4GB from 12am to 8am.
I tested between PC and Mac at the same time for a few days and download on a Mac is amazing compare to a Window Pc.Got 17Gb within 4days so will reach 75GB soon!!!!so cool!!WILL NOT COMPLAIN ABOUT XNET SPEED ANYMORE!!!