When people have an incentive to build that fast and cut corners (which they will). Under normal circumstances dotting the i's and crossing they t's, it's 5 to 7 years. Remember, the US is temporarily running low on missiles because of how much explosives Trump dropped on Iran. They blew up a petrostate level of petroleum infrastructure to the tune of $58B in damages of specialized engineering, about 15% of the country's total GDP. If recreating that in a quarter was possible, everyone with a drop of oil under their toes would do it.