The beginning seems to go by quickly, but the later chapters seem to take longer (for me at least, also playing on Zealot for the first time). I'm on Chapter 13 with 8 hours in, so I'd say it takes a good 10-12 hours to beat the game, depending on if you get stuck or not.
Fairly short. I'm sure it only seemed that way due to the lack of having to go to tram station to tram station. Also because going from chapter to chapter doesn't require the need for it. But the game is fairly short.
PSN = AKA_Neku /// Too many games to play. I need to actually finish some of the ones I bought at full price.