Is there a single word to denote the amount of time before something expires? For example:

The password is valid for another 10 hours

What's the word that is equivalent to "good for a period of" ?

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    – MetaEd
    Jul 26 '16 at 18:38
  • 1
    You could say the password has a half-life of 5 hours :D
    – user180089
    Jul 26 '16 at 18:50
  • @V0ight LOL, but nope. You'd still have a portion left after 10 hours that way. ;)
    – NVZ
    Jul 26 '16 at 18:59

Different words can be used for this. In terms of lifespan (itself such a word), longevity is often used: "the length or duration of life." In terms of products, we often use shelf life: "the term or period during which a stored commodity remains effective, useful, or suitable for consumption."


You could use the word lifetime:

the duration of a thing's existence or usefulness.

"a plan to extend the lifetime of satellites"

"The password has a lifetime of 10 hours."

"The password's lifetime is 10 hours."

"The lifetime of the password is 10 hours."


The password has a lifespan of 10 hours.


noun The length of time for which a person or animal lives or a thing functions

From IBM Knowledge Center

"The password lifespan specifies the period of time before the password of a user account expires."

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