The phrase "at a time perhaps" is correct and usable in written English.
It can be used to suggest a possibility or to indicate that something may happen or be done at a specific moment in the future.
Example: "We could schedule the meeting for next week, at a time perhaps that works best for everyone."
Alternatives: "maybe at a certain time" or "possibly at a specific time".
For a while now — as long as I've worked for this magazine — I've worked on copy paper, buying a case at a time, perhaps two cases a year.
The "only one" syndrome – where a single black writer is allowed into the spotlight at a time – perhaps may have finally faded to memory.
"But it is coming back, and it's just that I have to eat a little at a time," perhaps four small meals a day.
The option to click through one feed at a time falls far short of the potential that RSS offers and as things stand the feed view in IE 7 is just a way to look at one page at a time, perhaps with truncated entries and without page design.
Unlike console and PC games where hardware remains fairly static for years at a time (perhaps less true for PC games, but developers have gotten into the habit of designing games for the lowest common denominator how else could I have run "Half-Life 2" a few years ago on a relatively underpowered PC?), cellphones change operating systems and internal circuitry seemingly every few months.
Some female New Mexico spadefoot toads (Spea multiplicata) only spawn half of the available eggs at a time, perhaps retaining some in case a better reproductive opportunity arises later.
Be a regular customer at a "slow" time, perhaps stopping by regularly for dessert and coffee or to pick up a little treat to go.
I believe this movie, unlike most others, could actually change the nation's conversation about race and reconciliation at a crucial time, perhaps even providentially.
"At an earlier time perhaps even six months ago, we were concerned almost entirely about young men, but in a more recent estimate by the national security agencies suggests that a growing number of young women are travelling to participate in that fighting as well," he said.
He had confidence in me at a time when, perhaps, nobody would have dreamed of giving me an opportunity.
And this was at a time when, perhaps, it would rather not be seen as upholding the federal government's right to flout state laws.
