The phrase "a time when field" is not correct and does not form a complete thought in written English.
It may be used in a context discussing a specific period related to a field of study or profession, but it requires additional context to be meaningful.
Example: "There was a time when field research was the primary method of data collection in anthropology."
Alternatives: "a period in which field" or "an era when field".
JODL: There was a time when Field Marshal Keitel was not in the War Ministry but in the field.
At a time when Field Marshal Tantawi has refused public explanations or interviews, the cables provide some insight into the American Embassy's perception of his priorities.
The researchers pulled together 28 studies from 1989 on (a time when field experiments on the topic became more common), which included 55,842 applicants for 26,326 jobs.
Small entered the field of primatology in the 1970s: a time when the field was in its infancy, and its research was fresh and largely unstructured.
Launch a five- to 10-year "gravity initiative" at a time when "the field of general relativity is subject to new activity and novel developments". Scholars in mathematics, physics, and astronomy would work together on the project.
Bennett says High convinced the hospital to invest in gene-therapy research at a time when the field had chilled.
Twain was writing in the late nineteenth century, a time when the field of meteorology was belatedly coming into its own.
Frances Benjamin Johnston made a career for herself as a photojournalist, at a time when the field itself was primitive and few women had careers at all.
At the Walter Cronkite School of Journalism and Mass Communication, on Arizona State's Phoenix campus, and across the country, professors are hustling to figure out how to teach journalism at a time when the field is undergoing a sweeping transformation.
In fact, even the term chemical science enjoyed some popularity in the nineteenth century – a time when the field sought to distinguish itself from alchemy and the promotion of quack nostrums.
