Can an ice age last for only 40 years?

The long-term theory of climate patterns states that the Earth experiences an ice age, freezing over and remaining so for about 40 years, before returning to a normal, seasonal climate. My question is: is it possible for an ice age to happen so quickly? Is 40 years too short, or is that perfectly feasible?

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Can an ice age last for only 40 years?

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