How long does it take to complete a mastectomy?

Less than two hours, depending on the doctor's hand fast fast, I saw the longest one more than three hours.

First local anesthesia, cut out the tumor, test whether malignant, malignant and then general anesthesia, do the overall resection, lymph is also to cut. However, before the doctor did the surgery, whether the malignant already have a number in mind.