How long is the game?

[Broken_Ai]

How many levels are there and any idea how long it takes to complete? How much replability is there I see steam workshop is in experimental atm.

[wout]

Just finished it in about 2.5 hours. It's a cool game but very short :)

[Zilto]

5 hours for me

[Zefnoly]

2 hours. Although about a year ago I also watched it on youtube. But I forgot most the puzzles since then.

[HelmTo108]

I wandered a lot and tried to get places I wasn't supposed to and I was about 5 hours.

[YellowAfterlife]

I've put 10 hours into it so far - the storyline takes 2-3 hours (depending on how leisurely you play), then there's developer commentary mode, various challenges and multiple types of easter eggs (literal eggs, dexterity challenges, blueprints, misc.). Locations vary from "slightly not supposed to go"
https://steamcommunity.com/sharedfiles/filedetails/?id=2279409622
to "very not supposed to go"
https://steamcommunity.com/sharedfiles/filedetails/?id=2279318271
It would seem that any spot that is reachable - no matter how absurd it might seem - has something hidden in it.

[Weaver]

For a single play through if you don't get stuck on any puzzles or go hunting secrets, it's about 2 hours, the same length as Portal. If you do go hunting secrets you can spend a lot more time, and then there is the endless different modes and workshop levels.

[benrod]

According to Steam, 16 hours. Second round through should go much faster. Easter eggs, well now...