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I think it has occurred 7 times in the past, already. However, with the advent of new technology and communications, we may see an increase in speed with regard to these kinds of cycles. Who knows, though? It's not so much based on a time-table as it is based on how the general public has been conditioned to respond to a crisis, and how they have tended to behave during past cycles. Much can be learned about what comes next by knowing how it all went down the last time. Social human behavior is becoming easier to predict as time goes on, because we keep conforming to the same trends and making similar decisions - because all humans actually have many more similarities with each other, than they have differences.