Still, looking at ancient constructions, 150 years is a huge amount of time. Most roman constructions that have survived to today were built at most in a single

Still, looking at ancient constructions, 150 years is a huge amount of time. Most roman constructions that have survived to today were built at most in a single life time - at an extreme end, it seems that the Hagia Sophia was built in 5 years. The more than 4500 years old Great Pyramid of Giza was built in a single pharaoh's lifetime. Which is to say, engineering culture and goals can absolutely degrade over time in terms of productivity, even with great increases in construction technology.