average person remembers percent of what they hear
Studies have shown that immediately after listening to a 10-minute oral presentation, the average listener has heard, understood and retained 50 percent of what was said. Within 48 hours, that drops off another 50 percent to a final level of 25 percent efficiency. In other words, we often comprehend and retain only one fourth of what we hear. We all want to be more than 25 percent efficient.