Up until now there is little hard evidence on whether increase in time of surgery increases risk. Nevertheless, there is a considerable opinion that greater than 5 hours in surgery leads to increased risks (bleeding, fluid shifts, possibly infections). If there is a difference in risk between 3 hours of surgery and 5 hours that risk is small. However, particularly with abdominoplasty ( versus other elective surgeries), there is a definite small risk of blood clots in the leg veins, which can be quite serious if they break off and go the lung. Doing the procedure under sedation ( Monitored Anesthesia Care) with local anesthesia probably eliminates this risk, but most surgeons use general anesthesia which is quite acceptable. However, it is important that they take precautions regarding blood clots, and it is import for you to ambulate soon after surgery. So...in general the less time under anesthesia the better, but if the operation is less than 5 hours, the increased time brings minimal if any additional riskUp until now there is little hard evidence on whether increase in time of surgery increases risk. Nevertheless, there is a considerable opinion that greater than 5 hours in surgery leads to increased risks (bleeding, fluid shifts, possibly infections). If there is a difference in risk between 3 hours of surgery and 5 hours that risk is small. However, particularly with abdominoplasty ( versus other elective surgeries), there is a definite small risk of blood clots in the leg veins, which can be quite serious if they break off and go the lung. Doing the procedure under sedation ( Monitored Anesthesia Care) with local anesthesia probably eliminates this risk, but most surgeons use general anesthesia which is quite acceptable. However, it is important that they take precautions regarding blood clots, and it is import for you to ambulate soon after surgery. So...in general the less time under anesthesia the better, but if the operation is less than 5 hours, the increased time brings minimal if any additional risk