“((Material Sum) / 48) * (1 - (Management Skill/50)) Quantity of NPCs * max(1.1 - Civ Level, 0.5) * Random Quantity of Materials Management Skill of Builder Number of NPC Builders (1.1 - Planet Civilisation Level) - minimum value of 0.5 Random (0.9...1.1) The above equation returns the number of days it takes to build the facility.- Rules ”