The first playthrough took me around 12 hours (actually the first playthrough got canned at 8 hrs when steam cloud erased my saves due to a power outrage. India is fun) Took my time exploring and recording some clips, so you can probably complete it in 10 hours. Next few playthroughs took me around 4-5 hours because I knew what to do and where to go then. Got all achievements and endings and the whole shebang. Also worth noting that the game around $20 in Indian Steam store.
Thanks. I'm interested in playing it, but I'm not sure if it's worth what they're asking for it over here ($45). I'll probably wait for a decent sale.