"within a certain duration" is correct and usable in written English
You can use it when you are talking about something that exists, happens, or is done over a specific period of time. For example: "We must complete the project within a certain duration or else it will not be finished on time."
On Friday, in an interview with foreign newspaper and magazine reporters, he said that if the bombing did not achieve its objective of toppling the Taliban "within a certain duration," it should be abandoned in favor of a political strategy that would unseat the Taliban.
It represents the average number of patients who must be treated to prevent one adverse outcome within a certain duration of follow-up time, and is calculated by inverting the absolute risk reduction (ARR) [ 1, 2].
Milestones are unique achievements in NFSMW, like evading the cops within a certain duration or being caught by a speed camera while driving at a certain speed.
Mercury light filtered with a GFP filter was applied to the larva preparation with a certain duration of time.
Each transmission was done with a certain transmission power level and took a certain duration.
If the load rate exceeds 1 for a certain duration, a queue forms and accumulates upstream.
Constraining the note to be of a certain duration limits the number of notes we have available in the database.
Context information remains temporally valid for a certain duration, which depends on the type of context data.
Here's a graph showing the "estimated probability of a relationship surviving to a certain duration, for relationships lasting three months or longer".
After a certain duration (35 minutes, in this case), the perceived time shortening effect seemed to stabilize.
In other words, it does not identify a certain duration of migration.
