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"in 4 weeks" is correct and usable in written English
You can use it to specify a future period of time. For example, "I'll be able to finish the project in 4 weeks."
Exact(57)
And of life in general: "In 4 weeks' time, everything stops in the country.
The 34th year of Lincoln Center's Mostly Mozart Festival, concluding 32 concerts in 4 weeks at 3 sites, is going out in grand style.
The new Apple TV will be available in 4 weeks, with pre-orders starting today.
Children were asked to complete the program in 4 weeks, with approximately 1 lesson per day.
The headache gradually decreased in frequency and intensity, and completely ceased in 4 weeks of therapy.
If I had done MDH today, I might have made $1m in 4 weeks rather than 4 months".
The site, which was only built in 4 weeks, has a database of volunteer opportunities around the country.
Polyaniline silver composites were produced slowly in 4 weeks in good yield, except for the reaction, which took place in sulfamic acid solution, where the yield was low.
Similar(3)
Measurable tumours formed in ∼4 weeks after inoculation.
Diagnostic criteria for acute invasive rhinosinusitis requires disease presentation to occur in <4 weeks.
Randomised trials testing curatively intended RT (≥60 Gy in >4 weeks/>50 Gy in <4 weeks) on SCC of the oral cavity, oropharynx, hypopharynx, and larynx published as full paper or in abstract form between 1975 and 2003 were eligible.
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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