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31,709,792
approximately 5 billion years.
There are 31,540,000,000,000,000 (31 quadrillion, 540 trillion) seconds in 1 billion years.
Approximately 24,020,167.4277 years, give or take a day depending on how close to a leap year you started the quadrillion second count. 1 quadrillion is 1 with 15 zeros => 1,000,000,000,000,000. 1 quadrillion divided by 86,400 (seconds in a day) is around 11,574,074,074.0741 days. If you take this number of days, and divide by 365, you get approximately 31,709,791.9838. To compensate for leap year, you have to subtract a day for every 4 years, but then you have to re-add a day for every 100 years, and then finally subtract an additional day for every 400 years. The reason for this, is a leap year happens every 4 years, unless the year is evenly divisible by 100, unless it is also evenly divisible by 400.
To convert seconds to years, you need to divide the total number of seconds by the number of seconds in a year. There are 60 seconds in a minute, 60 minutes in an hour, and 24 hours in a day, which equals 86,400 seconds in a day. There are 365 days in a year, so there are 31,536,000 seconds in a year. Dividing 1,000,000,000,000,000,000,000 seconds by 31,536,000 seconds in a year gives you approximately 31,688,087 years.