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The main focus is player customisation, and with modding , the possibilities are endless 

I understand but how many hours of fun would you estimate I could get out of the game in it's current state?:)

There are already many production lines. For comparison, KatherineOfSky did a Let's Play in Alpha 1 with 16 videos of 20 to 40 minutes each. That was Alpha 1, and now we're on Alpha 3, with a lot more content., and it will only get more deep and complex (but not complicated)