Session Time: The time taken by each session of FUE may extend to 2 to 4 hours. It sometimes requires more than one session according to the percentage of hair loss and the area which the doctor intends to cover. Hence, the overall treatment duration may take multiple days. Mega Sessions: Sometimes there is what is called a “mega session,” which can last anywhere from 10 to 12 hours. These are a little more unusual and typically used in patients who may require large amounts of hair to be transplanted at a given time. Total Time: Overall, this may take about 7 to 8 hours for one sitting, depending on the size of the bald area of the head that is to be covered. The total time taken for the whole treatment program, however, depends on the need of every individual and perhaps even on the surgeon.