The phrase "a time of vast" is not complete and lacks context, making it difficult to determine its correctness in written English.
It could be used in contexts discussing significant periods or events, but it needs additional information to clarify its meaning.
Example: "We are living in a time of vast changes in technology and society."
Alternatives: "an era of great" or "a period of immense".
The 1980's, too, were a time of vast mediocrity.
At a time of vast consolidation in the radio industry, WEVD has been an exception.
His inspirations are the metaphysical poets, especially Donne, who wrote in another complex era, the Elizabethan period, a time of vast explorations and expanding horizons.
So at a time of vast needs, from Haiti to our own cities, here's a nice opportunity for symbiosis: so many afflicted people, and so much benefit to us if we try to help them.
The big decrease in the inequality of cheer occurred roughly between the early 1970s and 1990 — a time of vast social and legal change when new freedoms and protections made their way into different aspects of life and work.
It can scarcely be said to have removed money from elections (money has found plenty of other ways in), but it did provide an elegant solution to problems created by the sudden and dramatic expansion of the electorate in a time of vast economic inequality.
At a time of austerity, again we are paying vast sums to the European Union".
Many of the more popular Twitter users who have autofollow enabled are now following tweets from thousands of people at a time, the vast majority of which they clearly aren't paying attention to.
For a time, vast numbers of flatboats, forerunners of today's barges, conveyed agricultural commodities, raw materials, whiskey, livestock, and people downriver.
The Notre Dame sociologist Christian Smith once summarized the moral narrative told by the American left like this: "Once upon a time, the vast majority" of people suffered in societies that were "unjust, unhealthy, repressive and oppressive".
Using nonart materials — torn and cut cardboard, chicken wire covered with paste-soaked newspaper — he made miniature cars and tenements, street signs and figures, painting all the forms black around the edges, as if they'd been singed by fire, an apt suggestion of vulnerability at a time when the vast stretches of the city were being demolished in the name of urban renewal.
