The clue is in the question - in 1 billion seconds, there are 1 billion seconds!
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1 Billion Seconds = 11574 Days.
1,000,000,000 seconds or 31.688 years
There are 31,540,000,000,000,000 (31 quadrillion, 540 trillion) seconds in 1 billion years.
There are 16,666,666.7 minutes in one billion seconds.
There are 3.1556926x1010, or 31,536,000,000 (31.5 billion) seconds in 1 millennium.