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Millions and millions of years
6minute
Rock caverns are not built they are eroded out of solid rock by natural processes.
how long does it take to make a crayons
a 100 years
2 weeks
10,000,000+ years
thousands to millions of years
It may take centuries for a soil to become fertile through the breakdown of rock and the accumulation of organic material, but human mismanagement can destroy that fertallity within a few years.
a very long time
millions of years
As long as you make it take.