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" ?
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."