Now that you are asleep or sedated and properly numb, it is time for the surgery to take place. During this time, your anesthesia personnel will be with you constantly maintaining your level of anesthesia. This includes carefully monitoring your vital signs and measuring the level of the anesthetic you are receiving. Once the anesthesiologist is satisfied with the level of the anesthesia it is now time for the surgeon to start the case. For a general anesthetic, it usually takes 10 to 15 minutes from the time a patient gets in the room until the surgery starts.