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The phrase "another four days" is correct and usable in written English.
You can use it when referring to an additional period of four days that is being added to a previous timeframe.
Example: "I thought the project would be completed today, but it looks like we need another four days to finish everything."
Alternatives: "four more days" or "an additional four days".
Exact(44)
The cells were cultured for another four days and collected at day 8 of differentiation for each assay.
The cells were removed from the activation plate on day 4. Th1 and Th2 cells were cultured for another four days in the absence of CD3 and CD28 stimulation.
The case continues with another four days of his testimony.
The group has another four days in quarantine.
The window for competition is open for another four days.
Another four days of interminable questioning went by – even the interrogators were bored now.
Similar(16)
Then we put in another three days.
For another six days, no coverage.
Samye was another two days' march.
I will go another fifteen days and will be released.
The next Presidential debate isn't for another ten days.
More suggestions(1)
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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