How long is a billion sceonds in years?

Answer 1

Not accounting for leap years, a billion seconds is 31.7 years.

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If your year is the period of time printed on a calendar, then you have to

worry about leap years.

If your year is the length of time the Earth takes to complete one orbital revolution

around the sun, then you don't, because all years have the same length.

1 billion seconds = 31.6875 [sidereal] years (rounded)