One billion seconds is equal to approximately 31.71 years, or 31,709.79 days to be more precise.

To arrive at this value, we can divide one billion seconds by the number of seconds in a day. Since there are 86,400 seconds in a day (24 hours x 60 minutes x 60 seconds), we can calculate the number of days as follows:

1 billion seconds ÷ 86,400 seconds/day = 31,709.79 days

Therefore, one billion seconds is equivalent to approximately 31,709.79 days, which is almost 31,710 days.