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"duration" is also used as a crossword clue. If that's what you saw, the answer is often time (4 letters).
Definitions
continuance in time
Word origin
From Middle English duracioun, from late Old French duracion, from Medieval Latin dūrātiō.
Used in a sentence
“The duration of the flight will be about 2 hours 45 minutes.”
“She was moaning for the entire duration of the advert break.”
“an intermission of 15 minutes' duration”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer2 curated clues
01“Time span”8 letters
02“Continuance in time”8 letters
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