One of the first questions almost every new client asks is some version of "how long is this going to take?" The question is reasonable. Therapy costs money, time, and emotional energy, and people want a sense of the runway. The honest answer is that it depends, but "it depends" is not very useful. So here is a more useful version.

Short-term, focused work: 8 to 16 sessions

For a specific, well-defined problem with no major complicating history, a course of evidence-based therapy is often 8 to 16 sessions. This applies to:

  • Single-incident anxiety: a phobia, panic that started recently, social anxiety in a specific context.
  • Mild to moderate depression: a depressive episode without a long pattern of recurrence.
  • Insomnia: CBT-I, the gold standard for chronic insomnia, typically runs 6 to 8 sessions.
  • Acute adjustment issues: a job change, a move, a relationship transition.
  • Specific skill-building: learning emotion regulation, communication skills, assertiveness training.

These cases respond well to structured protocols like CBT, ACT, or behavioral activation. You will know within 4 to 6 sessions whether the work is moving. If it is not, your therapist should be the one to bring that up.

Medium-term work: 6 to 18 months

Most people in therapy are in this range. This includes:

  • Recurrent depression or anxiety: patterns that have been around for years and need both symptom management and underlying work.
  • Trauma processing: EMDR, CPT, or prolonged exposure for PTSD typically runs 12 to 30 sessions, sometimes more depending on the complexity.
  • Couples therapy: 6 to 12 months is typical for couples doing real structural work.
  • Life transitions with grief: divorce, loss, identity shifts.
  • ADHD treatment: typically 6 to 12 months of weekly or biweekly work to build durable skills.

At this scale, you should expect noticeable change within 3 to 4 months. Total resolution is usually not the goal. Substantial change is.

Long-term, deeper work: a year or more, sometimes much more

Some work takes longer. This includes:

  • Complex trauma, including childhood abuse or sustained adversity.
  • Personality patterns that have been around since adolescence.
  • Attachment work and relational patterns that recur across relationships.
  • Some forms of OCD, eating disorders, or treatment-resistant depression.

This is not a failure of therapy. Some patterns are deeply layered and the brain rewires gradually. The goal in long-term work is not to "finish" but to keep building the life you want while the underlying patterns continue to shift.

What predicts how long therapy will take

  • How long the problem has been around. A pattern of 20 years takes longer to shift than one of 6 months.
  • Whether there is co-occurring complexity. Anxiety plus trauma plus sleep issues takes longer than any one of them alone.
  • Frequency. Weekly therapy moves faster than biweekly. Twice a week, when warranted, moves faster still.
  • Engagement between sessions. The clients who do the work between sessions move twice as fast as the clients who only think about therapy during the session.
  • Fit with the therapist. The therapeutic alliance is the single most-studied predictor of outcome.

How to know it is working

By session 6 to 8, you should be able to name something specific that has shifted. Not necessarily a resolution, but a difference: you notice a thought pattern you didn't see before, you respond to a trigger 10 percent better, you have language for what was previously vague. If by session 8 nothing has shifted, the work needs to be re-examined.

How Lifespan thinks about pacing

At Lifespan: Center for Family Psychological Services in Westlake Village, we set explicit treatment goals at the start of care and revisit them every 8 to 12 sessions. If progress is not where it should be, we talk about it. If you have hit your goals, we taper. We do not believe in indefinite therapy by default. We do believe that for some people, the right work takes time.