The phrase "agencies at a time" is correct and usable in written English.
It can be used when discussing the number of agencies involved in a process or event simultaneously.
Example: "We can only collaborate with two agencies at a time to ensure effective communication and management."
Alternatives: "agencies simultaneously" or "agencies concurrently".
The Shabab have detonated countless suicide bombs and are blocking Western aid agencies at a time of famine.
That did not affect earnings, but it might have provided reassurance to bond rating agencies at a time when Enron's credit rating was crucial.
Eviscerating regulations and reducing funding of crucial government agencies at a time of growing needs will make all of us poorer and weaker, not richer and stronger.
She also criticized the White House for putting new burdens on agencies at a time when they are already dealing with serious budget cuts.
His capture, they said, is a relief to American intelligence agencies at a time when the Bush administration has been criticized for having failed to apprehend the terror network's most notorious leaders, including Mr. bin Laden.
Former United States officials say Mr. Montesinos was the only official in the Fujimori government capable of coordinating law enforcement and military agencies at a time when Peru was the leading producer of coca for cocaine trafficking.
Suppose an election were coming up with that word in the title of the agency at a time when that word was in headlines for some other reason.
A1 Michael D. Brown resigned as director of the Federal Emergency Management Agency, saying he wanted to avoid distracting the agency at a time when it faces a major challenge.
At the same time, a lengthy investigation into C.I.A. wrongdoing could immediately chill the relationship between the White House and the spy agency at a time when the C.I.A. is central to the American campaign against terrorism.
Backlogs of F.B.I. background checks from past naturalization petitions are dogging the Citizenship and Immigration Services agency at a time when it is swamped with 1.4 million new petitions from aspiring citizens in the past year.
