How Long Does Fistula Surgery Take?

Fistula surgery can take anywhere from about 15 minutes to well over 7 hours, depending almost entirely on which type of fistula is being treated and how complicated the anatomy has become. A straightforward anal fistula operation typically runs 25 to 60 minutes, while a complex enterocutaneous fistula repair in the abdomen can stretch past an entire workday in the operating room. The word “fistula” covers a surprisingly wide range of conditions, and the surgical time frames are just as varied.

Simple Anal Fistula Surgery

The most common reason people search for fistula surgery times is a perianal fistula, an abnormal tunnel between the inside of the anal canal and the skin near the anus. For straightforward cases, a fistulotomy (laying open the tract) or a similar procedure is one of the shorter operations in general surgery. A large study tracking outcomes at two university hospitals found a median operating time of 40 minutes, with the middle half of patients falling between 25 and 60 minutes.¹ Most people are in and out of the operating room within about an hour for the surgical portion alone, though you should plan for additional time getting checked in, prepped, and monitored afterward.

That 25-to-60-minute window assumes the fistula is relatively simple, meaning its tract runs through a small amount of sphincter muscle and follows a fairly direct path. When the tract is short and superficial, some surgeons finish in under 20 minutes. The biggest variable is how much time is spent examining the tract under anesthesia, sometimes using a probe or dye, to make sure no hidden branches are missed before the actual cutting begins.

Complex Anal Fistula Techniques and How They Compare

When an anal fistula passes through a large portion of the sphincter muscle, surgeons avoid simply cutting it open because doing so could compromise bowel control. Instead, they turn to sphincter-sparing techniques, and these generally take a bit longer than a basic fistulotomy.

Two of the most studied sphincter-sparing approaches are the ligation of the intersphincteric fistula tract (known as LIFT) and the mucosal or endorectal advancement flap (MAF). In a head-to-head comparison among elderly patients, the LIFT procedure had a median operating time of about 27 minutes, while the advancement flap took a median of 34 minutes.² A separate meta-analysis pooling data from randomized trials confirmed that LIFT consistently runs shorter than the advancement flap, with an average difference of roughly five minutes less in the operating room.³ The advancement flap also tended to carry a higher rate of postoperative complications in that elderly group, though it produced less pain on average.²

Five minutes may not sound like much on paper, but in ambulatory surgery where patients go home the same day, shorter operating times translate into less anesthesia exposure, faster recovery room turnover, and fewer opportunities for things to go wrong. That said, the choice between LIFT and a flap depends on fistula anatomy and the surgeon’s experience, not solely on which one is quicker.

How Anesthesia Choices Affect Time in the Hospital

The clock that matters most to patients is not just the operating time but the total time from arrival to discharge. For anal fistula procedures done on an outpatient basis, anesthesia type makes a major difference in how long you spend in recovery.

A randomized trial comparing ultra-low-dose spinal anesthesia with perineal nerve blocks for anorectal surgery found that the nerve block group had significantly shorter surgical times, averaging about 28 minutes compared with 43 minutes in the spinal anesthesia group.⁴ The difference partly reflects the time it takes to position the patient and wait for the spinal block to take full effect, which eats into the total procedure clock even though the actual surgery is the same.

The recovery room adds even more variation. A prospective study of outpatient anorectal surgery patients found that those who received intravenous sedation with local anesthesia were ready to go home in about 79 minutes on average, while patients who had regional anesthesia spent an average of 161 minutes in the recovery unit, roughly twice as long.⁵ If you are trying to estimate your total time at the surgical center, adding the recovery window to the operating time is more realistic than focusing on the procedure alone. For a straightforward anal fistula under local anesthesia with sedation, plan for roughly two to three hours from check-in to walking out.

Vesicovaginal Fistula Repair

A vesicovaginal fistula (VVF) is an abnormal connection between the bladder and the vagina. It most commonly develops after gynecologic surgery or, in resource-limited settings, prolonged obstructed labor. Repair takes substantially longer than any anal fistula procedure.

A study of VVF repairs following obstetric and gynecologic surgery found that the route of access made a large difference. Vaginal repair averaged about 112 minutes, while abdominal repair averaged about 204 minutes, nearly twice as long.⁶ Abdominal repair also meant more blood loss and a significantly longer hospital stay, averaging close to 9 days compared with about 5 days for the vaginal approach.⁶

The abdominal route is generally reserved for fistulas that are located high in the bladder or are large and difficult to reach from below. Surgeons typically prefer the vaginal approach when anatomy allows, both because it is faster and because it avoids the recovery burden of a full abdominal incision. If your surgeon recommends the abdominal route, it usually reflects the fistula’s position rather than a preference for a longer operation.

Enterocutaneous Fistula Surgery

Enterocutaneous fistulas, abnormal connections between the intestine and the skin of the abdomen, are in a different category entirely when it comes to surgical duration. These often develop after prior abdominal surgery and involve dense scar tissue that must be painstakingly separated before the fistula itself can be addressed.

A 23-year review of definitive surgical repairs for enterocutaneous fistulas found that more than a third of cases lasted longer than 7 hours. Operations exceeding 8 hours were associated with more than double the risk of the fistula coming back and were also linked to higher one-year mortality.⁷ These are among the most technically demanding operations in gastrointestinal surgery, and the length reflects the complexity of dealing with scar tissue, restoring bowel continuity, and closing the abdominal wall.

Not all enterocutaneous fistula repairs are marathon operations, however. A case report of a laparoscopic repair for an enterocutaneous fistula that developed after a previous colon surgery described a total operating time of 110 minutes, with the majority of that time spent freeing up adhesions rather than performing the actual repair.⁸ The difference between under two hours and over seven hours usually comes down to how many prior surgeries the patient has had, how extensive the scarring is, and how many segments of bowel are involved.

Arteriovenous Fistula Creation for Dialysis Access

Not all fistula surgeries are repairs. An arteriovenous (AV) fistula is intentionally created to connect an artery and a vein, typically in the forearm, to provide reliable access for hemodialysis. The surgery to create one is quite different from every other procedure discussed so far.

Traditional open surgical creation of an AV fistula usually takes about 1 to 2 hours, including setup. But a newer percutaneous approach, where the connection is made through a catheter inserted in the blood vessels rather than through an open incision, is dramatically faster. A study of 234 patients who had percutaneous AV fistula creation reported a technical success rate of 99% and an average procedure time of just 15 minutes, with a range of 7 to 35 minutes.⁹ This is among the shortest fistula-related procedures in medicine and reflects the minimally invasive nature of catheter-based work. Patients generally go home the same day.

The tradeoff is that a percutaneous AV fistula still requires a maturation period of several weeks to months before it can be used for dialysis, and some patients need additional procedures to help the fistula develop properly. But from a pure operating-time standpoint, this is as fast as fistula surgery gets.

Staged Procedures and the Seton Approach

Some fistulas, particularly complex anal fistulas involving a lot of sphincter muscle or those associated with Crohn’s disease, are not treated in a single operation. Instead, surgeons take a staged approach that unfolds over months. The most common first step is placing a seton, a thin thread or rubber loop that is passed through the fistula tract and left in place. The seton keeps the tract draining and prevents abscess formation while the surgeon plans the definitive repair.

Seton placement itself is a short procedure, typically taking 15 to 30 minutes. But the total treatment timeline stretches much longer. In a study evaluating seton-based strategies, more than half of patients needed the seton replaced at least once, with the majority requiring two replacements before moving on to definitive treatment.¹⁰ Each replacement is another brief trip to the operating room. So while no single procedure is long, the cumulative time in surgery across all stages can add up to several separate visits over many months.

For patients with Crohn’s disease, where the fistula is driven by chronic inflammation, surgery is almost always staged. Surgeons typically start with drainage and a seton, often paired with medication to reduce the underlying inflammation, before even considering definitive repair. The question in these cases is less “how long does the surgery take” and more “how many surgeries will I need and over what period,” because the answer is often two to four procedures spread over six months to a year or more.

What Happens Before and After You Are in the Operating Room

When people ask how long the surgery takes, they often mean the total experience, not just the time the surgeon is working. Several steps add to the clock that are easy to overlook when reading about procedure times in medical literature.

Before the incision, there is a check-in and preoperative assessment that typically takes 30 to 60 minutes. This includes verifying your identity and surgical site, inserting an IV, and reviewing your history with the anesthesiologist. If you are getting general or spinal anesthesia, there is an induction period where the drugs take effect and the surgical team positions you, usually in the prone jackknife or lithotomy position for anorectal procedures. That positioning step alone can take 10 to 15 minutes.

After surgery, you move to a recovery area. As noted earlier, recovery times vary widely depending on the anesthetic used, from roughly an hour with local anesthesia and sedation to close to three hours with a regional block.⁵ For a simple outpatient anal fistula procedure, a reasonable estimate is 3 to 5 hours total from the time you walk in to the time you leave. For an inpatient procedure like an abdominal VVF repair or enterocutaneous fistula surgery, the operating time is just one piece of a hospital stay lasting several days to weeks.

Why Estimates Vary So Much Between Patients

Even within the same procedure type, individual operating times spread over a wide range. Several factors explain why your surgeon may not give you a precise number when you ask.

Fistula anatomy: A fistula with a single straight tract is faster to address than one with multiple branches, horseshoe extensions, or tracts that weave through deep tissue planes. The surgeon often does not know the full anatomy until they are looking at it under anesthesia.
Prior surgery and scarring: If you have had previous operations in the same area, scar tissue slows everything down. The enterocutaneous fistula data illustrate this dramatically, where prior abdominal surgery turned some procedures into all-day events.
Body habitus: In patients with a higher body mass index, exposure can be more challenging and add time, particularly for perineal and abdominal procedures.
Surgeon experience: High-volume surgeons who perform fistula operations regularly tend to work faster and more efficiently. This is especially relevant for sphincter-sparing techniques like LIFT and advancement flaps, which have a technical learning curve.
Intraoperative findings: Sometimes what was expected to be a simple fistulotomy turns out to involve more sphincter muscle than preoperative imaging suggested, and the surgeon switches to a sphincter-sparing technique mid-procedure. That mid-course change adds time but protects your continence.

Preoperative MRI is commonly used for complex fistulas to map the anatomy in advance, and it can reduce surprises in the operating room. But imaging does not eliminate intraoperative judgment calls entirely, and the actual operating time can still differ from what was estimated during your preoperative consultation.

Pediatric Fistula Surgery

Perianal fistulas in infants and young children are managed differently than in adults. They are far more common in boys under one year of age and tend to be superficial, which means surgery, when needed, is usually quick. Many pediatric perianal fistulas resolve on their own or with simple drainage, and when surgery is performed, it is typically a straightforward fistulotomy that takes 15 to 30 minutes. The main difference is that children almost always require general anesthesia even for brief procedures, so the induction and recovery phases make up a larger proportion of the total visit compared with adults who may receive only local anesthesia with sedation.

Parents are often more concerned about the anesthesia than the surgery itself, and appropriately so: the procedure time is short, but the total time the child is away from the parent, including anesthesia induction and monitored recovery, is usually one to two hours. Recurrence rates in children are generally low for simple fistulas, so repeat procedures are uncommon.

When a Fistula Comes Back

Recurrence is a reality with fistula surgery, and it affects how you should think about total surgical time over the course of your treatment. Recurrence rates for complex anal fistulas vary by technique but commonly fall in the range of 10% to 30% across published studies. The enterocutaneous fistula data are bleaker: prolonged operations and high blood loss were each independently associated with more than double the risk of the fistula returning.⁷

A recurrent fistula generally means another operation, and the repeat procedure is often more complex than the first because of scar tissue from the prior surgery. If you are weighing different surgical options and your surgeon recommends a technique that takes a bit longer but has a lower recurrence rate, that extra time in the operating room may actually save you from a second, more difficult operation down the road. The meta-analysis comparing LIFT and advancement flap, for instance, found the two had similar recurrence rates despite the difference in operating time, suggesting the choice should rest on anatomy and the surgeon’s expertise rather than on shaving a few minutes off the clock.³

1
PubMed Central. Long-term outcomes after anal fistula surgery: results from two university hospitals in Thailand
2
PubMed Central. Mucosal advancement flap versus ligation of the inter-sphincteric fistula tract for management of trans-sphincteric perianal fistulas in the elderly: a retrospective study
3
PubMed. Endorectal advancement flap compared to ligation of inter-sphincteric fistula tract in the treatment of complex anal fistulas: A meta-analysis of randomized clinical trials
4
Brazilian Journal of Anesthesiology. Effectiveness and safety of ultra-low-dose spinal anesthesia versus perineal blocks in hemorroidectomy and anal fistula surgery: a randomized controlled trial
5
PubMed. Prospective evaluation of anesthetic technique for anorectal surgery
6
Taiwanese Journal of Obstetrics and Gynecology. Clinical relevance and treatment outcomes of vesicovaginal fistula (VVF) after obstetric and gynecologic surgery
7
JAMA Surgery. Definitive Surgical Treatment of Enterocutaneous Fistula: Outcomes of a 23-Year Experience
8
Journal of Minimally Invasive Surgery. Laparoscopic Repair for Enterocutaneous Fistula Caused by Laparoscopic Right Hemicolectomy for Pan-Peritonitis due to Cecal Cancer Perforation
9
PubMed. Midterm results of percutaneous arteriovenous fistula creation with the Ellipsys Vascular Access System, technical recommendations, and an algorithm for maintenance
10
Wiley Online Library (Health Science Reports). Evaluation surgical strategies in perianal fistulas treatment: Efficacy draining seton compared to other surgical approaches; a case‐control study