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Discover LudwigThe phrase 'whether or when' is correct and can be used in written English.
It is typically used to suggest uncertainty or ambiguity regarding a situation or timeline. For example: "We're still not sure whether or when he will arrive for the meeting."
Exact(60)
Whether or when that will happen now is unknown.
Obviously the future is uncertain: no one knows whether, or when, growth will materialise.
It is unclear whether or when Mr. Zheng will be executed.
There's no word yet as to whether, or when, the extended editions will hit UK cinemas.
Whether or when they wear the Roman collar after that is a secondary issue".
Bernanke said he doesn't have any news on whether or when he might retire.
It remains unclear whether or when the government plans to arrest Mr. Hutomo.
Others are struggling with the question of whether - or when - to offer it.
But it was unclear whether or when a legislative response would receive a vote.
It is unclear whether or when the gas will be switched back on.
The agency report did not clarify whether or when North Korea would release the crew.
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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