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There are, roughly, pi times 10 million seconds in a year (the actual number is 31,556,926, but "pi times 10 million" is close and easier to remember). So just multiply that by that large number of years, and there's your answer.

So 1,000,000,000 years equals 3.1556926 × 1016 seconds.

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12y ago
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Q: How many seconds in 1000000000 years?
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