1 million seconds is equal to approximately 11.57 days, while 1 billion seconds is equal to approximately 31.71 years.

To be more specific, one million seconds equals 1,000,000 seconds, and since there are 86,400 seconds in a day (24 hours x 60 minutes x 60 seconds), 1 million seconds divided by 86,400 seconds/day equals 11.57 days.

On the other hand, one billion seconds equals 1,000,000,000 seconds, which is a thousand times greater than one million seconds. Therefore, 1 billion seconds divided by 86,400 seconds/day equals 31.71 years.