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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.
Definition of 'time frame'. time frame. The time frame of an event is the length of time during which it happens or develops. The time frame within which all this occurred was from September 1985 to March 1986. Discussions at the U.N. could include a time frame for action.