I would imagine much less time than a huge power plant, with its much more steel, copper, aluminum, concrete, etc. Don't forget the extraction process for coal

I would imagine much less time than a huge power plant, with its much more steel, copper, aluminum, concrete, etc. Don't forget the extraction process for coal, gas, or clear cutting entire valleys to make damns. You are comparing wind power to 'nothing'. You need to compare it to the alternatives.