Thats a really slow connection. I take it thats mega bits per sec. not mega bytes.
1.8Mbps, is about 220k a sec. So 65GB at 220k(kilobytes) is about (I get it to) about 3 and a half days.
I guess math was never my strong point however.
For comparison my connection does about 54Mbps down, which took about 3 hours to download the game.