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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.
Space of seconds, minutes, hours, days, weeks, months or years with an established beginning date and ending date. It's a unit of measurement used to categorize a length of time. Also called timeframe. Use time period in a sentence. I did not know the time period of when the package would ship and when it would arrive at my house and it made me agitated. You need to know how to accurately predict how your product will sell during a time period so you have enough on hand.