Just wondering, is this a 5 hours game or more like a 20+ hours game? does it have replayability?

From what I heard from the players who really enjoyed the game - they usually spend 20 hours to get to the end. Just keep in mind that this game is very slow paced, methodical rather than guns blazing, and there's a lot of "juggling" of inventory due to the limited capacity you can carry.

I completed everything i could before finishing the game, took me 50 hours. First playthrough, i went back and foward from the areas, many times, going back to sell loot, i think i overdid it too, finished with way too much cash.