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Discover LudwigThe phrase "four hour" is not correct in standard written English; it should be "four-hour" when used as a compound adjective.
You can use it to describe something that lasts four hours or is related to a duration of four hours.
Example: "We have a four-hour meeting scheduled for tomorrow."
Alternatives: "four-hour duration" or "four-hour event."
Exact(4)
Equilibrium time was more than four hour.
Four hour max means less training.
"Four hour coach, mate," he says.
All peer volunteers participated in a four hour training session.
Similar(54)
Twenty-four houraceses were held in 1929 31.
My twenty-four hour commute?
A Twenty-Four Hour Pout Period.
Twenty-four hour "Walmart Garden" sections.
Twenty four hour news and talking heads don't help.
Twenty-four hour collection, storage and transportation render it inconvenient.
Twenty-four hourineine samples were also collected.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com