No idea. It took about 25 minutes for me. It seems weird that it would be busier now than when I did it (soon after it became available). But who the heck knows? Hopefully it will jump down to a reasonable time soon. Good luck, man.
Umm ... my usage didn't increase anywhere NEAR 3.2GB. I don't know what you're looking at, but it certainly didn't use that much on my iPhone (or iPad, for that matter). And you don't think that I understood that Siri's problems were a situation caused by overload? Really? Does everything need to end with a "/s" these days? EDIT: YAY! Siri is back. I can rest soundly tonight. ;)
Same thing happened to me for a long time. Eventually, I FLIPPED OUT and hit update on my iPhone repeatedly, over and over, and suddenly it gave me the D/L and Install screen. :) I think there are just too many people trying to d/l, and then there are morons like me hitting the button over and over again. Sorry.