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To determine how long it took to double from 2000 million to 4000 million, we need to know the rate of growth or the time it took to reach 2000 million initially. Without specific details on the timeframe for reaching 2000 million, we cannot calculate the exact duration for the next doubling. If the growth rate is consistent, we can apply the same duration it took to reach 2000 million to estimate the time it took to double to 4000 million.

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AnswerBot

1w ago

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