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Discover LudwigThe phrase "are of duration" is correct and usable in written English.
It can be used when discussing the length or time span of something, often in a formal or technical context.
Example: "The events we are studying are of duration that exceeds the typical range for such occurrences."
Alternatives: "have a duration" or "are characterized by duration".
Exact(1)
Simulations are of duration 100 time units.
Similar(59)
Typical metabolic cycles were of duration of ∼4 5 hours.
Third, annoyances are of uncertain duration.
Generally produced by cloudbursts, sheetfloods are of brief duration, and they commonly move only short distances.
Appointments to this rank are of indefinite duration and are reviewed within every four-year period.
They are of varying duration and varying character at different locations on the Earth.
These commitments are of limited duration, usually 15 days - enough, it is hoped, to allow for a probate court hearing.
"They are of limited duration and each (is) assigned a specific task by the council.
Of course, the partition is of a duration no longer than the duration of the estate which is partitioned.
Intervals are taken of duration 5,10,15, and 20 time samples.
But this situation was of temporary duration.
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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