an ion isn't a unit of time. Gigaannum is a billion years.
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One billion milliseconds is equal to approximately 11.5741 days. This is equal to approximately .0317 years.
Check your math and your answer....one billion divided by 31,536000 = 31.7 years, not 31 thousand years. It is actually 31 years, 259 days, 1 hour, 46 minutes and 40 seconds 1 Billion seconds equal 1 billion divided by the number of seconds in a year (31,536,000) equals 31,709.79 years. So just about 32 thousand years
1000 billion is equal to a trillion
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A billion = 1,000,000,000.