Hello,
Last night for the first time I had a hang at 10% - it stuck there for about one minute then let me in the game with no problems. For comparison sake I am usually in the world within about 20-30 secs. So not much issue for me, but I just wanted to chime in as 10% is where it hung for me as well.
I have a I7 4770K, and a GTX 760 running driver 347.09 and this was in single player. Hope it helps!