The phrase "at one time did" is correct and usable in written English.
It can be used to refer to a specific moment in the past when something occurred or was true.
Example: "At one time did the town thrive as a bustling center of trade before the economy declined."
Alternatives: "once did" or "formerly did".
A mother of five who at one time didn't have "enough money to put milk and cereal on the table for my children," Victoria has turned her sometimes-harrowing experiences into a successful heart based business, making mindful changes out of a person's debilitating lies and transforming them into powerful and freeing truths.
And this was a child that at one time did not want to go to school".
2. Schiele at one time did fashion sketches himself and preferred to wear clothes of his own design.
"Not at one time did she ever bring up to me any issue or any problem on our football team," Barnett said.
United Media at one time did about $1 million a year in graphics business with Enron, creating graphic illustrations for executive presentations, according to people who worked at the company.
"Every processor that could fail at one time did," he said, a problem made worse by a number of software failures "and some where we weren't quite sure if they were hardware or software".
With 25 down at one time do you think we'd have a shortage?
We usually don't use so many at one time, do we Neil?
Thus, the common situation is that a value of k at one time does not correspond to the same value of k at a later time, and, unless some data are missing, there will be a total of (t max /τ) n individuals.
That's because, in part, simply evaluating growth rates in democracies and nondemocracies at any one time does not yield useful comparisons.
And since our short term memory is only capable of holding about three things at any one time, don't overwhelm your listener with too much content in a short amount of time.
