My Steam timer says 10 hours but the in-game timer says 7.8 hours. I guess some people might take less but you need to get the biomass in most chambers at 5 stars and that takes a bit and some extra thinking. Getting all the research was fun as well.
Had to consult a walkthrough with the endings since what you have to do to end the game was pretty vague, it's probably my only gripe with the game.
Experimenting with all the seeds and stuff was a VERY nice break from all the shooting and mind games from Spec Ops (which I finished last week). It has a very weird 2001 A Space Odyssey feel at times. Liked the voice acting but since I'm not english I can't tell if it's good or just ok. It sounded great to me, loads of expressive voices.
So, yeah, heavily recommended. I for once I'm loving these games I can sit to pick up and play knowing they aren't 100+ hours bloated marathons. I sadly no longer have the time for that and only did one small concession with Dark Souls because, well, DARK SOULS.
Damn that is longer than I expected. I'll give it a try soon, thanks!