Just a pinch over 4 hours on my recorded game time now. Although a couple of mission restarts probably puts me closer to 4 and half hours. This is a game where checkpoints would have been nice. The Motherbase stuff is picking up some, the X-Com feel to it is pretty strong. Watching all your teams and balancing them correctly is important to keeping things running smoothly. And it's becoming more and more obvious they have taken more than a peek at the Monster Hunter Portable play book (which makes the collaboration between the two franchises make even more sense). The extra ops sit in where the more benign gathering quests would have been in MH. They are usually quick ways to grab some new soldiers for your team, and  pick up some resources, great for the short bus hop. Story has been the proper balance of the grim nature or war and geopolitical machinations, juxtaposed against the sometimes random and wacky conversations that Kojima seems to love. The boss battles are ramping up as  the following screenshot will show: