Duration vs Lifetime

When to use each in English, with meaning, register, and examples.

Duration

Top 2,000 (common) B2 noun

Lifetime

Top 2,000 (common) B2 noun

	Duration	Lifetime
Pronunciation	🇬🇧 /["/djuˈreɪʃn/"]/ 🇺🇸 /["/duˈreɪʃn/"]/	🇬🇧 /["/ˈlaɪftaɪm/"]/ 🇺🇸 /["/ˈlaɪftaɪm/"]/
Meaning	The length of time something lasts.	The length of time someone lives or something lasts.
Example	The school was used as a hospital for the duration of the war.	She has dedicated her lifetime to studying rare plants.
Register	Neutral	Neutral
How common	Top 2,000 (common)	Top 2,000 (common)
CEFR level	B2	B2
Part of speech	noun	noun
Collocations	brief, short, limited, decrease, reduce, shorten, for the duration (of), of… duration, throughout the duration of	long, short, entire, devote, spend, take (somebody), achievement, appointment, employment, after a lifetime, during somebody’s lifetime, in your lifetime, the habits of a lifetime, a legend in your own lifetime, half a lifetime
Antonyms	moment, instant	short-lived, temporary, ephemeral
Common mistakes	Confused with 'session', which refers to a specific meeting or period of activity., Using it incorrectly as a verb, e.g., 'to duration something.', Mixing it up with 'interval,' which refers to a break or pause rather than the length.	Confused with 'life span' — 'lifetime' refers to the duration more broadly., Using 'lifetime' to describe specific events instead of overall duration., Incorrectly pluralizing to 'lifetime's'.
Usage notes	Commonly used in both formal and informal contexts. Refers to time periods, such as how long a movie is or how long an event lasts. Avoid using it in very casual conversations.	Use 'lifetime' to describe the duration of a person's life, a period of existence, or the duration of an object or concept. It's suitable for both spoken and written English. Avoid using 'lifetime' in very casual conversations where simpler terms like 'time' or 'years' may suffice.

See it in real clips

So prepare for the chance of a lifetime

Sherlock › S1 E1

Of course. Yes. Enough for a lifetime, far too much.

The Lord Of The Rings › The Fellowship Of The Ring

I would rather share one lifetime with you...

So prepare for the chance of a lifetime

Sherlock › S1 E1

Of course. Yes. Enough for a lifetime, far too much.

Lifetime

Frequently asked questions: Duration vs Lifetime

What's the difference between Duration and Lifetime?

Duration: The length of time something lasts. Lifetime: The length of time someone lives or something lasts.

Are Duration and Lifetime the same CEFR level?

Duration: B2, Lifetime: B2 on the CEFR scale.

What part of speech are Duration and Lifetime?

Duration: noun, Lifetime: noun.

Can you show an example of each?

Duration: The school was used as a hospital for the duration of the war. Lifetime: She has dedicated her lifetime to studying rare plants.

Can I use Duration and Lifetime interchangeably?

Not always. Duration and Lifetime are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.