Which one is correct?
"at certain time during" or "at time n during"?

Question

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Some examples from the web:

They can block unwanted (in and outbound) traffic, allow it at certain time during the day, give priority to certain hosts, and enforce many other related policies.
Breathing is irregular at certain time during sleep and the sufferer may hold his breath for long periods of time. This is called an apnea episode or apnea event.
Apr 8, 2015 ... What you neglected to account for, however, is that at certain time during these 2 months you upgraded disks on your database servers to much ...
In addition, a tour desk will be available onsite at the Convention Centre at certain time during the event to enable you to find out more and book tours.

Some examples from the web:

At time n during trial t, this distribution is called T t;n pxy(a)], and assigns joint probabilities to the complete set of transition probabilities. The agent uses Bayes' ...
At time n during trial t, this distribution is called T t,n[pxy(a)], and assigns joint probabilities to the complete set of transition probabilities. The agent uses Bayes' ...
observed labels at time n. During subsequent epochs, probability estimates of the outgoing state at time n - lover increasing forward decoding depth k = 1, .
somes is shown at time n. During differential reproduction, in which chromsomes are chosen to reproduce based on their individual fitness, the first chromsome ...

A complete search of the internet has found that "at certain time during" is the most popular phrase on the web.

Last Updated: October 31, 2015