Estimate the length of a human lifetime, in seconds

Answer 1

Jane

Say mean length = 78 years

1 year = 365.25 days (every 4th year is a leap year)

1 day = 24 hours

1 hour = 60 minutes

1 minute = 60 seconds

So 78 years = 78 x 365.25 x 24 x 60 x 60 seconds = 2 461 492 800 s (so 2.5 billion approximately)

Mike