Average around 2.5 to 3 hours (but you should leave it plugged in for a while even after it says fully charged)
And yes, it will show a plug icon instead of a power/spark icon inside the battery on the top right corner.
It took about two hours (I looked at the clock when I plugged it in, and it was at two hours that I noticed it was done). I didn't leave it plugged in past that though. I didn't look for the plug icon, but I know it was done because I had been watching the large battery icon filling up, and it showed as full about 15min before I unplugged it. Next time, I'll check for the plug icon in the right corner. Thank you for the info!