Minecraft wiki entry for Door-based_iron_golem_farming, associated text: This design is a 168 village iron farm that can be rebuilt on demand if not built in the spawn chunks and the chunk it is in has been unloaded. This iron farm resets 2 villages at the same time giving it a faster reset speed than most other designs. The village rebuild process takes 96 minutes and it will produce 6700 ingots per hour when running at full speed.