How many years is the catastrophe mentioned in Buddhist scriptures?

Robbery is big, medium and small. Unless otherwise specified, general robbery usually refers to big robbery. Since the age of ten, life expectancy has increased by one year every hundred years, reaching 84,000 years, which is an increase in robbery; Since the age of 84,000, life expectancy has decreased by one to ten years every hundred years. This is robbery, and one increase and one decrease is a small robbery, which is about16.8 million years. A robbery includes twenty small robberies, which lasted about 336 million years. A big robbery includes four big robberies in bad space, which is about1344 million years. (The above calculation is purely based on Confucian classics, but it is difficult to know the sacred meaning, and I dare not say that it is absolutely correct. )