Unfortunately the law of large numbers means that your surgeon may routinely perform longer procedures and have never experienced a complication. This does not make the increase risk reasonable. To paraphrase the line from Top Gun, is your surgeon writing checks your body can't cash? If the extra hours under generally anesthesia double the risk of death or significant morbidity, is it safe or reasonable? That might depend on how you judge risk. For example, having liposuction under general anesthesia has a risk of death that is between 1 in 5,000 cases to 1 in 40,000 cases depending on whose numbers you believe. However, doing the same liposuction under local anesthesia is a associated with a risk of death that is less than 1 in 300,00 cases. Despite this, many people continue to have liposuction under general anesthesia. Returning to your case, many people are often swayed by the surgeon's argument that you can recover from 3 procedures in the time of 1 procedure and you will save money because the first hour of anesthesia is the most expensive, or that your surgeon has truthfully never experienced an issue doing lengthy surgery. All of these things may be true. However, what is extra safety worth to you? Unfortunately that is not a question that your surgeon can answer for you. If you are not comfortable, do not allow yourself to be hustled into so much surgery at one time. Do what feels comfortable. Don't be bullied by your surgeon.