I just completed obduction. It is developed by the same development company that brought you Myst and Riven. I probably put in somewhere around 12 to 15 hours. But if I had to go through and do it again I could probably complete it in 6 or so. Completely worth the price of admission for the game. I also really enjoyed the Solus project and The Gallery: Call of the Starseed Episode 1. Also if you can get Wilson's Heart. That was another pretty enjoyable puzzle Style Adventure
If you haven't figured out by my list of games I really enjoyed puzzle Style games
I really liked Myst and Riven, especially the music. They were hard though and I often got stuck and had to refer to a walk thru to get past quite a few of the puzzles.
So I was going to download Obduction, started reading some of the reviews in Steam and it looks like there was a lot of dissing the game play. Load times between scenes was really slow. Something about you have to "transport" a lot in the game and that would take forever and I guess in some levels you had to transport quite a bit to solve the puzzles.
That kind of turned me off from trying it, maybe I'll check it out again.
Gerry