Well, this debunks the length rumor for me. Easy mode took them 7-8 hours. I am planning on doing the hardest for Review.
_______________________________________________
"JVM, a french magazine (which is by the way holding a Masterclass Keynote this Thursday in Paris with Ru Weerasuriya from Ready At Dawn Studios) has published its review of the new PS4 Big Exclusive ahead of the launch day this Friday. They said that despite the pacing of the game not so good due to a lot of cut scenes (although interactive at some point with QTE)representing half of the game that last for them 7-8 hours on easy mode, the first new IP from RAD looks absolutely gorgeous, with some good shooter gameplay with only some bad stealth part, a very good soundtrack and voice acting but most of all, the atmosphere of the game as well as the universe of The Order is so compelling that you want to completely dive in and immerse yourself"
http://n4g.com/news/1673609/the-order-1886-first-legit-review-15-20