What are synonyms for duration?

Here are some synonyms for duration, depending on the context:

General synonyms:

* Length

* Period

* Span

* Time

* Extent

* Term

More specific synonyms:

* Lapse (of time)

* Interval

* Stretch

* Run

* Course

* Spell (e.g., a spell of bad weather)

* Tenure (for a job or position)

Formal synonyms:

* Chronological extent

* Temporal duration

The best synonym to use will depend on the specific context and the desired level of formality.