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The phrase "about three hours" is correct and usable in written English.
It can be used when estimating a duration of time that is not exact but close to three hours.
Example: "The meeting will take about three hours to complete."
Alternatives: "approximately three hours" or "roughly three hours".
Exact(56)
"There's about three hours of daylight now.
This should take about three hours.
(A full charge lasts about three hours).
The multicourse dinners are expected to take about three hours.
"I was in," Ms. Curiel said, "for about three hours".
Participants had about three hours to carry out the task.
In about three hours.
For about three hours.
"Only about three hours".
It should be about three hours.
This went on for about three hours.
More suggestions(16)
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com