How long does EMDR take to work?

The honest answer to this question is a number followed by a large caveat, and the caveat is more important than the number.

But you came here for the number, so here it is.

The number

A single traumatic incident, in an otherwise stable adult, can usually be processed in one to three reprocessing sessions.

That is Shapiro's own benchmark, and it is not marketing. It comes from the trials.

Two randomised controlled trials of single-trauma survivors found that between 84 and 90 percent of participants no longer met criteria for PTSD after three 90-minute sessions. A study at Kaiser Permanente found that six 50-minute sessions eliminated PTSD in 100 percent of single-trauma victims. Effects appear comparable whether sessions run 90 minutes or 50.

Tal Croitoru, writing for clients, puts it as roughly four to five hours of processing for around 80 percent of single-trauma cases. Same ballpark.

So if you were assaulted once, or had a car crash, or witnessed something horrifying, and your life is otherwise reasonably held together, you are looking at a handful of sessions.

That is genuinely fast. It is one of the reasons people are drawn to EMDR, and it is one of the reasons some clinicians are sceptical of it.

Now the caveat

The number above applies to a specific and rather narrow situation: one discrete event, in a person with decent affect tolerance, a stable living situation and adequate support.

Most people who walk into a therapy room do not present like that.

The same Kaiser Permanente study that cleared PTSD in 100 percent of single-trauma victims in six sessions cleared it in 77 percent of multiple-trauma victims. Same treatment, same dose, different population, different result. That gap is the whole story.

If you have multiple traumas, the work is done systematically, usually in chronological order, one memory at a time. There is no shortcut. Each one is its own piece of work.

And if what you have is complex trauma, the childhood kind, the kind that went on for years and shaped who you became rather than interrupting who you already were, then you should mentally throw the number away.

Shapiro was explicit about this. For survivors of long-term, multiple-event trauma, comprehensive reevaluation can involve targeting, reaccessing and revisiting over many months. Treatment can run for many months, and so can the follow-up needed to make sure the person integrates back into a functioning life.

Rotem Brayer is blunter, and I would put his sentence on the wall of every EMDR clinic in the country. Some EMDR leaders, he says, give the inflexible recommendation to process trauma within a small number of sessions, and this is unrealistic and can be dangerous, especially in complex cases.

Dangerous. Not just optimistic. Dangerous.

Why the preparation phase eats the timeline

Here is the thing nobody puts in the marketing copy.

Before any bilateral stimulation happens at all, there are two phases. History taking, and preparation. And the length of the preparation phase is the single biggest variable in how long your EMDR takes.

Croitoru describes the range plainly. For some clients, the first two phases take thirty minutes. For someone who has been through serious trauma, or a run of events with a cumulative weight, it takes considerably longer. And in cases involving severe addiction or dissociative disorders, preparation can run for weeks or months.

His rule of thumb is useful. If you are functioning, working or studying, living your life, then you probably already have the resources to start processing. If you are not functioning, the work is to build those resources first, and processing waits.

Brayer goes further, and this is the part that most changes the arithmetic. For clients with complex developmental trauma, he says establishing the therapeutic relationship can take weeks, months, or even years. And if the client does not feel safe with you, every clever regulation technique you taught them in phase 2 is going to fail when it is actually needed.

So when someone asks how long EMDR takes and the answer is "months", that does not usually mean months of eye movements. It means months of building the conditions under which the eye movements will not hurt you.

That is not the therapist stalling. That is the therapy.

What "working" even means

The other reason this question is hard is that "work" is doing a lot of work in the sentence.

Do you mean the memory stops being distressing? That can happen in a single session, and often does. You can watch a SUD score go from an 8 to a 1 in ninety minutes.

Do you mean you stop having nightmares? Usually a bit later, and it tends to follow the processing of the specific image that the dream keeps returning to.

Do you mean the trigger stops triggering? That is a separate piece of work. The standard EMDR protocol is three-pronged: past memories, present triggers, and a future template. Clearing the memory does not automatically clear the trigger, and clearing the trigger does not automatically install the new way of being in the world. Each prong takes time.

Do you mean your life changes? That takes longest, and it is the one that matters. Shapiro's point about reevaluation is that a person is embedded in a social system, and a profound shift in one memory ripples outwards into relationships, work, family, all of it. The clinician's job in the final phase is not just to check the memory is dead. It is to check the person has integrated.

Croitoru offers a useful set of markers for whether therapy is actually working, and none of them are about session counts. Fewer nightmares. Less anxiety. A rise in hope, in self-esteem, in a sense of competence. Improvement in work, in relationships, in family life. A change in how you see the world.

Notice that these are outside-the-room criteria. If your SUD scores are dropping beautifully and nothing in your life is different, something is wrong.

What I would actually tell you

If you have one clean trauma and you are otherwise well: expect somewhere between three and eight sessions total, including the assessment and preparation. Do not expect one. Shapiro was clear that responsible EMDR treatment includes proper history taking and follow-up alongside the reprocessing sessions, and that clients should not be treated in a single session, because processed material sets off new internal and external reactions that need attention.

If you have several traumas: expect longer, and expect it to be worked through systematically rather than all at once.

If you have complex or developmental trauma: expect a long preparation phase, expect the relationship itself to be part of the treatment, and be suspicious of anyone who promises you a number.

And in all cases: the honest answer from a good therapist to "how long will this take" is "I will know better after a few sessions". Anyone who gives you a confident figure in the first ten minutes is either very experienced with a very simple presentation, or they are selling.

The thing to hold onto

EMDR in-person and online EMDR therapy really can be fast. For single-incident trauma it is one of the fastest effective treatments we have, and after decades of therapy being assumed to take years, that is worth saying clearly.

But speed is a property of the case, not a property of the therapy.

If you have carried something for thirty years, it is not a failure that it takes more than three sessions. It is not evidence that EMDR does not work on you, or that you are too damaged for it. It means you are complex, and complexity takes time, and the good therapists know that and the reckless ones do not.

The right pace is the pace you can survive. Anything faster is not a bargain.

This is general information, not clinical advice. If you are considering EMDR, discuss with an accredited therapist what a realistic course of treatment looks like for your situation.

References

Brayer, R. (2023). The Art and Science of EMDR: Helping Clinicians Bridge the Gap. PESI Publishing.

Croitoru, T. (2014). The EMDR Revolution: Change Your Life One Memory at a Time. Morgan James Publishing.

Marcus, S., Marquis, P., & Sakai, C. (1997, 2004). Kaiser Permanente EMDR studies.

Rothbaum, B. O. (1997). A controlled study of EMDR for PTSD in rape victims. Bulletin of the Menninger Clinic.

Shapiro, F. (2017). Eye Movement Desensitization and Reprocessing (EMDR) Therapy: Basic Principles, Protocols, and Procedures (3rd ed.). Guilford Press.

Wilson, S. A., Becker, L. A., & Tinker, R. H. (1997). Fifteen-month follow-up of EMDR for PTSD and psychological trauma. Journal of Consulting and Clinical Psychology.