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The phrase "days during which" is correct and usable in written English.
You can use it whenever you want to refer to a specific period of time. For example, "We will be closed for the two days during which the holiday falls."
Exact(60)
He often has juice days, during which he consumes nothing but "litres of greens".
Putin's move comes after two days during which the Kremlin's motives were unclear.
Under California law, Honda has 30 days during which to appeal the judgment against the company.
The mission lasted nearly eight days, during which time Sharman conducted medical and agricultural tests.
Days that were not considered sacred were called dies vacantes, vacant days, during which people worked.
Those days, during which the novel takes place, were Monday, July 13, through Wednesday, July 15, not 17.
I'd have been in bed for three days, during which I've had time to sketch out the story.
Eight days had passed since his emergency surgery, eight days during which he had slipped in and out of consciousness.
The 11 days during which the girls were missing had us in the fist of its despairing mystery.
"The Gulf of Mexico blowout was stopped in 87 days, during which time it inflicted damage worth at least $40bn.
The early days, during which he attempted to brand the Enquirer as a serious, upscale weekly, were rocky.
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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