The duration of theis dependent on multiple factors. Namely:
1) The number of grafts being implanted
2) The procedure being followed
The number of grafts being implanted
Grafts or hair roots that are extracted and implanted in a procedure determine the duration of the surgery. Each graft can have 1-5 hair strands. Many clinics use hair and grafts interchangeably which is an unethical practice as each graft can contain 1-5 hair.
The Procedure being followed
Majorly, there are two types of Hair Transplant surgeries. (The other types are variants of these procedures)
FUE: Follicular Unit Extraction, as the name suggests, each hair unit is individually extracted i.e each graft is individually extracted. It is a very labour intensive process and the time of the surgery depends upon the experience of the Hair Transplant Team.
At Berkowits, we boast of a highly skilled Hair Transplant Team that can implant upto 3500 hair grafts in 8 hours.
FUT: Follicular Unit Transplant or Strip Hair Transplant, uses a strip of the scalp to extract hair grafts. A strip of the scalp is cut and is handed over to an experienced technician to dissect and separate the hair grafts from. It usually takes 4 to 6 hours.
Below is table that takes into account the procedure and the number of grafts to approximate the surgery time.