This is the complete tour of the Black Hills Caverns. It usually takes 1 hour to complete. It includes all 3 levels of the cave, approximately 3/4 of a mile. See the BEST VARIETY of cave form This is the complete tour of the Black Hills Caverns. It usually takes 1 hour to complete. It includes all 3 levels of the cave, approximately 3/4 of a mile. See the BEST VARIETY of cave formations on this tour!ations on this tour!