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The phrase "around three hours" is correct and usable in written English.
You can use it when estimating a duration of time that is approximately three hours, without being exact.
Example: "The meeting will last around three hours, so please plan accordingly."
Alternatives: "approximately three hours" or "about three hours".
Exact(29)
The Dubrovnik tour lasts around three hours.
If the jam occurs at 7am, it takes around three hours to clear.
In normal times, the journey might have been expected to take around three hours.
It takes around three hours to complete the 10km loop of its base.
The train from London Paddington to Hereford takes around three hours.
It will exchange the faulty part with a new one, which should take around three hours.
Similar(31)
Train back to Tashkent (around five hours).
The journey took around five hours.
Gaza has around two hours electricity a day.
Flying from Dubai to Larnaca takes around four hours.
Manual annotation took around two hours for a single image.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com