@bowlisimo The game is 15 chapters. I beat it in about 9 hours according to Steam. At least three of those hours were spent on Chapters 12-14.
But, I recognize that the situations are different. I’m awful at shooters, so I’m sure you will have a much easier time with it. The firefights actually became grueling in a really satisfying (albeit frustrating) way. This will make sense when you get there. I would play it on Medium. If I can finish it, anyone can finish it. I’m one of those people who spends time looking at the ceiling or my feet because I’m not quite fluent in shooter controls.
The game over screens do add a bit to the experience. Without spoiling anything, a lot of the interface stuff in the game adds to the experience, something you’ll notice if you keep a critical eye every time you start the game up.