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within a relatively short period of time stresses
gen.	за сравнительно короткий срок (CNN, 2019 Alex_Odeychuk); за относительно короткий промежуток времени (CNN, 2019 Alex_Odeychuk)
cliche.	за сравнительно короткий период времени (If the petroglyphs were made within a relatively short period of time, they may tell a story, said James Dodd, a researcher at Aarhus University in Denmark and the Tanums Hällristningsmuseum's Rock Art Research Centre Underslös in Sweden. livescience.com ART Vancouver)