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The phrase "a certain time period" is correct and usable in written English.
It can be used when referring to a specific but unspecified duration of time in various contexts, such as historical events or project timelines.
Example: "The research focused on the effects of climate change during a certain time period in the 20th century."
Alternatives: "a specific timeframe" or "a particular duration".
Exact(60)
I don't think it's purposeful, but I'm from a certain time period.
The goal is to restrict street parking for a certain time period, say two or six hours, said Donald Marra, the village administrator.
The modification was completed after a certain time period.
The search was not restricted to a certain time period.
Their dynamics are observed over a certain time period starting from predetermined initial configurations.
It is necessary to conduct an internet auction in a certain time period.
The VER offers customers PPPs, which offer certain electricity tariffs for a certain time period.
After a certain time period of savings, SHGs may approach the bank for a loan.
This kind of procedure guarantees that all tags' IDs are identified within a certain time period.
On average, an arbitrary node has encounters (i.e., transmissions/receptions) over a certain time period.
The simultaneous activities occur at a certain place for a certain time period.
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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