A One Letter Change

At my start I last a mere eleven days,
But change one letter and I’m over 31 years.

What am I?

One million seconds (about 11 1/2 days).

Change the “m” to a “b” to get one billion seconds (about 31.7 years).

It’s rather surprising that a million seconds and a billion seconds differ by such a large duration.

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3 Comments on "A One Letter Change"

NB says
January 4, 2019 @ 11:33

Hardly ‘surprising’ one is 1000x longer ! ?

Hi there says
August 26, 2020 @ 23:45

NB – It’s because we use them interchangeably – ‘it lasted a million years’/’it lasted a billion years’. That makes it kind of weird that they are different. Big numbers like that, when you really think about them, are mindboggling.

Riddler says
January 23, 2021 @ 06:32

I dont think most people will get it right(i did not gat it right)

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