I would only play an hour or two after work because I have a big family and lots of responsibilities. It took me about a month per playthrough. I would say minimum 30 hours but more like 50 if you take your time.

Yes, I didn't mention this but, I decided to stop playing after my third playthrough. It was actually a bit of an emotional decision and I missed playing because I had spent so much time enjoying the game over three or so months. That is how I knew it was a good game.