The download is very small.. took me about 10 seconds. The installation however... that took like 2 hours for the FULL game.
It took you 10 seconds to download 15gb? Lol. I'm sure you mean the patch after the disk installation?
My game took about 10minutes to install (On an SSD though). And I got it on time in the end, so happy days.
Diablo 3 is very very fun. Playing Nightmare through now, level 42 or so.