30kbs x 60 seconds x 60 min x 24hrs in a day = 2592000 = 2.592 gigs.
I avg about 2.4, because I use a dl manager. If the site you're downloading from allows it, you can open more than one connection to that site (if it doesn't, using multiple proxies works too) hereby maxing out my downloads. Another plus about download accelerators is the fact that you can download from multiple, different sites at the same time.
I prefer using Flashget (it has multi-proxy support) and Internet Download Manager.
My problem is with torrents. I am a member of a local torrent site. My download speeds are excellent, but my upload speeds are minimal to non-existant. Obviously if I can't upload, I will eventually be ejected by aforesaid torrent site because of a bad download/upload ratio. Anyone able to help me with this one?