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"for how long" is a correct and commonly used phrase in written English
You would use it to ask how much time something has taken or will take. For example, "For how long have you been working here?"
Exact(60)
For how long, though?
"For how long?" I asked.
"For how long?" I persist.
For how long now?
"For how long?" Judge Zubov grew interested.
For how long will it exist?
For how long have you owned it?
For how long, no one really knows.
For how long, Dickens wants to know.
For how long, nobody knows.
For how long would it continue?
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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