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It's a good, solid 3 hours. It could be longer or shorter depending on how you play the game.
It's really really fun! (if that's any concellation)

ok cool thank you much. i might have to pick it up!

It's like 2-3 hours. It's nothing special, but at only 10 bones it might be worth getting.

Actually, if you don't collect any metal and jut go through the quest, you might finish it in about an hour, maybe a little more.

collecting steel is really, REALLY boring! If you take your time, maybe 3 hours at most.

You can stretch your time to  a good five hours if you do everything(Side Missions).