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Best Answer: Right now, according to the dictionary, it's still two. Though it could change with the common usage to either hyphenate time-frame or to put it all in one word.
to set a timeframe synonym, to set a timeframe definition | Thesaurus. n. exp. n. n. a teamwork session in the visual domain (design, architecture, urban planning) organized on the purpose of finalizing a project within a previously defined timeframe.