I don't know what type of connection you have, Zec, but it took me a little more than an hour to download the EA, which is roughly 8 gb. If the full game is 3-4 times that in size... that means it will take 3-4 more hours, minimum. Not 20 minutes. And if thousands of people are trying to download it at the same time, it might be even slower.
That's why I would really like to know if there will be preloading or not. Now I know not to stay up Wednesday night waiting for it after midnight, but I don't know if it will be effectively playable for me Thursday morning or afternoon.
Jea i did a bit improved connection last year I remember that it took me longer for some other ones (ffs first time WoW when I was downloading (yes I used to play wow too

) it took me whole night. But I guess it will took you bout 2h-3h max I know longest downloads I had was doom (but that is about 70 gig and i think Witcher 3 (about 50gig) but my advice to you if it takes that long, start download and watch some movie (longer one, like LOTR or if you like classics "Longest Day" those are longest ones I can remember atm)