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The phrase "a certain amount of weeks" is correct and usable in written English.
It can be used when referring to an unspecified number of weeks in a general context.
Example: "The project will take a certain amount of weeks to complete, depending on the resources available."
Alternatives: "a specific number of weeks" or "an unspecified duration of weeks".
Exact(1)
The owner occupies the property for a certain amount of weeks per year while they have guaranteed rent for the rest of the time.
Similar(59)
Different feeds will recommend changing types after a certain amount of time (6 weeks, 3 months, etc).. Introduce the chicks to the flock.
Limit yourself to a certain amount of money every week, (typically around $50-$50-$100d see if you can live off of just that amount every week.
With the union, McDonald's would have to give us a certain amount of hours per week.
Many agreed to do so for a certain amount of money a week in advance, only to renege when the day came to take the stage.
And they can only take a certain amount of referrals a week – so they might be full by Monday afternoon; that's hardly a rapid response.
For example, you might designate a certain amount of time each week for people to focus on independent work whether in the office or at home.
Motiv wants you to get a certain amount of exercise each week, and days accumulate progressively to that goal.
Here, the salon owner acts as a landlord, charging stylists a certain amount of "rent" each week to use a chair.
When I'm editing, I have to edit a certain amount of pages each week.
Like many other women of her generation, she was given a certain amount of cash every week as a household allowance and it was assumed that all expenses would be paid from that small, small fund.
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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