I have the international version and after reading a few user reviews I was a bit sad that this phone would be sat on charge for ages, but it turns out it very fast to charge.
Right now its plugged in to my pc keyboard feeding of its power to charge, and my stats say its going up 13% per hour....just off usb, and wifi is turned on.
I did read that the fast charge works with this version, I did hear that the AT&T does not have this enabled.