(Straight from Guerrilla Games mouth, the Day One Patch is a measly 250MB. Awesome!)

(Looking like this is the initial install. No way most people can download a 16GB patch in 15 minutes. Right?)

You knew it was coming. Most major AAA have one nowadays. The dreaded Day One Patch. Horizon’s patch? It’s a bit of a doozy… a whopping Patchasaurus 16GB of a download!!! Need proof? NeoGAF user Musician655321 shared the info. 

What do you guys think? Going to have to install the game and take me a short nap, it seems. 
Still.. DAY ONE, BRAH!