One billion milliseconds is equal to approximately 11.5741 days. This is equal to approximately .0317 years.
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One hour is 3,600,000 milliseconds.
One minute = 60,000 milliseconds.
There are 1,000 milliseconds in one second.
There are 1,000 milliseconds in one second.
One billion years is approximately 8,765,810,000,000 hours.