I clocked around 70 hours to complete the game. Saw both ending (normal and corruption one). Took around 300 days. It can surely be done faster, but I went mostly blind.
Putting adult content aside, it's a really great RPG game, gameplay wise. Decisions have a real impact and balancing the short-term gains vs long-term impact makes it really interesting. Spent a lot of time just planning my next move, because what you do have a real impact.