One of the questions we had before our surgery in March 2024 was how long the actual procedure would take. It is a reasonable thing to want to know, both for your own peace of mind and for whoever is waiting for you. Here is what you can realistically expect.
Typical operating time
A straightforward sleeve gastrectomy typically takes between 60 and 90 minutes of operating time. Some experienced surgical teams complete the procedure in closer to 45 minutes for uncomplicated cases. Others may take up to two hours depending on individual anatomy, the patient’s body composition, and any unexpected findings during surgery.
This is operating time only. It does not include the time you spend in the anaesthetic room being prepared, or the time you spend in recovery afterwards.
What happens in the anaesthetic room
Before you enter the operating theatre, there is a period of preparation in the anaesthetic room. Lines are placed, monitoring equipment is attached, and the anaesthetic is administered. This typically takes 20 to 40 minutes depending on how straightforward your cannulation is and whether any additional preparation is required. James had a documented adverse reaction to a component of standard anaesthetic protocols that had been identified before surgery. The team planned around this, which meant additional preparation time but a managed and safe outcome when the reaction occurred in theatre.
Recovery room time
After surgery, you are moved to the recovery room where you are monitored as the anaesthetic wears off. This phase typically lasts one to two hours. You will not be moved to your ward room until your vital signs are stable, your pain is managed, and you are sufficiently alert. The recovery room phase can feel longer than it is when you are in a groggy, disoriented state.
Total time from leaving the ward to returning
When you add pre-operative preparation, anaesthetic induction, the procedure itself, and recovery room monitoring, the total time from leaving your ward room to returning is typically three to five hours. Telling family or a partner to expect roughly four hours is a reasonable estimate, though it can vary.
What can make surgery take longer
Several factors can extend operating time. A significantly enlarged liver can make access to the stomach more difficult and require careful retraction. Previous abdominal surgery may have left adhesions, bands of scar tissue that need to be carefully worked around. Significant visceral fat, fat around the organs, can make the anatomical landmarks harder to see and the instruments harder to manoeuvre. Any intraoperative complication, including bleeding or staple line issues, will extend the procedure as the team addresses it.
This is why following the pre-operative liver reduction diet matters. James had NAFLD heading toward stage 3 liver failure, and reducing liver size before surgery made the procedure safer and more straightforward. Arriving for surgery with a reduced, more pliable liver is one of the things within your control that directly affects how the operation goes.
Does a longer operation mean something went wrong?
Not necessarily. A longer procedure can simply reflect individual anatomy or a more cautious and thorough surgical approach. However, if your surgeon or team tells you after surgery that there were specific challenges or findings, it is worth asking what was found and whether it has any implications for your recovery.
Conversion to open surgery
In a small number of cases, a laparoscopic procedure needs to be converted to open surgery, where a larger incision is made in the abdomen. This is not a complication in itself. It is a clinical decision made for safety when the laparoscopic approach is not working as expected. If this happens, operating time will be longer and the recovery period will be extended compared to a standard laparoscopic procedure.
Sources
NHS: Weight loss surgery. British Obesity and Metabolic Surgery Society (BOMSS): Sleeve gastrectomy patient information. NICE: Obesity: identification, assessment and management (NG238).
About this content
This blog is written by James and Kirsten, a couple from the UK who had gastric sleeve surgery together in March 2024.
We started this blog because we couldn't find any sources of content that details before surgery, the surgery and then life post surgery - so we decided to write one ourselves.
Everything on this site is based on our own experience and the research we have done along the way. It is not medical advice. Gastric sleeve surgery is a serious procedure and every patient's journey is different. Please always consult your own bariatric team or GP before making any decisions about your health or treatment.
Some posts on this site may contain featured or sponsored content, or affiliate links. Where this is the case, it will always be clearly stated at the top of the article. Our opinions are always our own.
Publish Date: 21 May 2026 | Last Reviewed: 7 June 2026 | Next Planned Review: 7 December 2027