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"have long known" is a correct and usable phrase in written English.
You could use it to describe a piece of knowledge that has been known for a long time. Example sentence: Historians have long known that Cleopatra was a powerful ruler.
Exact(60)
Doctors have long known this.
Politicians have long known this.
Meteorologists have long known that two factors play crucial roles.
Investigators have long known that the device failed.
Scientists have long known that Louisiana is sinking.
Chemists have long known that activated carbon adsorbs organic molecules.
Feminists and writers of speculative fiction have long known this.
Ornitholologists have long known that waterfowl migrate huge distances.
Democrats have long known how the McCain campaign felt.
Scientists have long known that sperm production requires coolness.
Americans have long known that these resentments existed.
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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