Nier Automata was developed by Platinum Games and only published by Square Enix. I'm talking about Square Enix the developer, not the publisher. Even Bethesda has done some good things as a publisher, their developed games are lacking. So the last 15 years of SE in terms of their big budget games, they have Dragon Quest 11? And even then, if I remember correctly, DQ has always had a pretty consistent creators working on the games and is about the only steady things SE has going for it. Also, DQ11 had a 4 year development cycle.
It took 30+ hours to get out of Midgar, which was a 3-4 hour experience. Getting to the Golden Saucer/Prison was a couple hours of game play, and I imagine leaving Midgar to these areas will also have side-quests left and right which will be put into development time. Barrett's story could be dragged out easily for a good 20+ hours like Midgar was. Also, you're still viewing this as what you got in the OG - this is not a remake, it's a sequel. Who knows what the hell they'll be doing with Zack - you could have an entire part of this game focused on him. They might pad out the Kalm story and you play as Zack.
This game is not coming out in 2 years UNLESS they start releasing it in smaller chunks. They are going to tard cum this baby for all it's worth, and you'll still be in here defending it.