How long does depression last?

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It depends, and here is what it depends on

Most people who ask this question want a single number. The honest version is a range, and what determines the range comes down to a few things. The type of depression. Whether the person has had episodes before. The severity of the current episode. What other conditions are present. What treatment is in place and how well it fits.

A psychiatrist or primary care clinician can usually give a realistic estimate after a full evaluation. Without an evaluation, any specific timeline is a guess.

How long an untreated episode usually lasts

The classical estimate for a major depressive episode without treatment is six to nine months. That figure comes from studies of patients followed before modern antidepressants were widely available, and from more recent cohorts who chose not to start treatment. Newer data shows that some untreated episodes resolve faster, but a meaningful share do not, and a smaller share become chronic. About 15 to 20 percent of untreated depressive episodes last more than a year.

Untreated depression is not a safe default. It carries risks that go beyond duration. Untreated episodes are associated with more suicide attempts, more relationship damage, more lost work, more substance use, and a higher likelihood of future episodes. The fact that an episode may eventually lift on its own is not a reason to wait it out.

How long a treated episode usually lasts

With treatment, the picture changes. Most people start to notice some change within two to six weeks of starting an antidepressant or beginning evidence-based psychotherapy. Sleep, appetite, and energy often shift before mood does. Mood and motivation tend to follow.

Full benefit often takes eight to twelve weeks. From the STAR*D trial, the largest U.S. real-world depression treatment study, about one third of patients reach full remission with the first medication tried. Roughly half show a meaningful response. By the time three or four sequential steps of treatment have been tried, about two thirds of patients reach remission.

Psychotherapy timelines look different. Cognitive behavioral therapy and behavioral activation are often planned as 12 to 20 sessions. Many people feel meaningfully better by the end of that course. Some need longer. Therapy gains tend to last longer than medication gains alone after treatment ends, which is one of the reasons combination treatment is often used.

The three phases of treatment

Clinicians often describe depression treatment in three phases. Knowing the phases helps with knowing the timeline.

1. Acute phase. From the start of treatment until the symptoms have mostly resolved. Usually six to twelve weeks. The goal of this phase is response and then remission.
2. Continuation phase. After remission, treatment is continued to prevent relapse. Usually four to nine months. Most relapses happen here if treatment stops too soon. The risk drops sharply once the continuation phase is complete.
3. Maintenance phase. For people with two or more prior episodes, or one severe episode, or strong family history, maintenance treatment can last one to several years. In some cases it continues indefinitely. This decision is made with the prescriber over time, not in advance.

What affects the timeline

Severity. More severe episodes usually take longer to resolve.

Type of depression. Persistent depressive disorder is, by definition, long. Bipolar disorder depression has its own course. Postpartum depression often responds well but can persist. Seasonal episodes tend to lift in spring even without treatment, though the lift can take months.

Number of prior episodes. The more prior episodes a person has had, the higher the risk of a longer course and of future recurrence.

Comorbid conditions. Untreated anxiety, ADHD, substance use, trauma, sleep disorders, and chronic medical conditions all stretch the timeline. So do untreated medical contributors such as thyroid disease, anemia, sleep apnea, vitamin deficiencies, and chronic pain.

Treatment fit and adherence. The right treatment at the right dose for long enough is much faster than partial treatment. Stopping too early, taking medication inconsistently, or attending therapy sporadically all lengthen the timeline.

Social support. People with at least one supportive relationship recover more quickly on average.

Sleep, movement, and substance use. Severely disrupted sleep, no movement at all, and ongoing heavy alcohol or substance use all slow recovery.

How long persistent depressive disorder lasts

Persistent depressive disorder, sometimes still called dysthymia, requires depressed mood most of the day, more days than not, for at least two years in adults (one year in children and adolescents). Many people with this diagnosis have had it since their teens or twenties. The pattern is long-running but treatable.

Treatment usually takes longer to show its full effect with persistent depressive disorder than with a discrete major depressive episode. Many people benefit from continuing both therapy and medication well after they feel improved. Cognitive Behavioral Analysis System of Psychotherapy (CBASP) was developed specifically for chronic depression and has evidence in this group.

How long bipolar depression episodes last

Bipolar depressive episodes are usually similar in length to unipolar episodes, but the overall course of bipolar disorder includes alternating periods of depression, mania or hypomania, and stretches of stability. Recognition of any history of mania or hypomania is important because it changes the treatment plan. A standard antidepressant alone can sometimes destabilize bipolar disorder. The Bipolar depression page on this site explains more.

How long postpartum depression lasts

With prompt treatment, most postpartum depressive episodes resolve within three to six months. Untreated, they can persist beyond the first year and shape the early months of a parent's life with a new baby in ways that carry forward.

Two newer medications are FDA-approved specifically for postpartum depression. Brexanolone is given intravenously over 60 hours in a healthcare setting. Zuranolone is an oral medication taken once a day for 14 days. Both target a specific neurosteroid pathway and have shown rapid effects in trials. Standard antidepressants and therapy are also used. The Postpartum Depression page on this site has more.

How long seasonal depression lasts

Episodes with a winter pattern tend to begin in late fall, deepen through winter, and lift in spring. Untreated, the lift can take three to four months. With bright light therapy (typically a 10,000 lux box for 20 to 30 minutes within an hour of waking), antidepressants, or cognitive behavioral therapy adapted for seasonal patterns, most people see meaningful improvement within one to three weeks. The Seasonal Depression page has more.

Treatment-resistant depression

When two adequate antidepressant trials have not produced a response, the term treatment-resistant depression is sometimes used. Adequate means the right dose for long enough, usually six to eight weeks at a therapeutic dose, not a short or low-dose attempt.

Treatment-resistant depression is not a final state. It is a signal that the next step is a thoughtful re-evaluation. Common steps from there include switching antidepressant class, augmenting with lithium or an atypical antipsychotic with evidence in depression, adding therapy if not already in place, addressing untreated medical or sleep contributors, and considering treatments such as esketamine (Spravato), intravenous ketamine (off-label), transcranial magnetic stimulation, or electroconvulsive therapy in severe cases.

Relapse versus recurrence

Clinicians use both terms with specific meanings.

A relapse is a return of symptoms before full recovery from the current episode. A recurrence is a new episode after a period of recovery.

About half of people who recover from a first episode of major depressive disorder will have another at some point. The risk rises with each subsequent episode. This is the main reason continuation and maintenance treatment matter. Stopping treatment as soon as a person feels well often shortens the window before relapse. Continuing for at least six to twelve months past remission, after a first episode, lowers the risk.

Response, remission, and recovery

Three words clinicians use that mean different things.

Response. A meaningful reduction in symptoms, usually defined as a 50 percent drop in a standardized score such as the PHQ-9 or the Hamilton Rating Scale for Depression.

Remission. Few or no symptoms, functioning at or near baseline, lasting for a defined period (often eight to twelve weeks in research, longer in practice).

Recovery. Sustained remission, usually four to six months or more.

The aim of treatment is recovery, not just response. Residual symptoms (lingering fatigue, sleep problems, low motivation) raise the risk of relapse. A treatment plan that produced a 50 percent improvement is often still incomplete.

When the timeline seems off

If treatment has been in place and the timeline does not match what was expected, a few questions are worth asking.

• Has the diagnosis been re-examined? Untreated bipolar disorder, untreated trauma, untreated medical contributors, or untreated substance use all keep depression in place.
• Is the medication at a therapeutic dose? Subtherapeutic dosing is a common reason a trial does not work.
• Has the trial been long enough? Six to eight weeks at a therapeutic dose is the floor for judging whether a medication is going to help.
• Is therapy in the mix? Combination treatment often produces faster and more durable results than either alone.
• Are sleep, movement, and substance use addressed? These are not optional.
• Is there ongoing acute stress or trauma exposure that is keeping the system activated?

If any of these are unaddressed, the next step is usually a conversation with the prescriber or therapist, not a conclusion that the depression will not lift.

What recovery actually looks like

The most common pattern is a gradual rise with weeks of clear improvement followed by stretches that feel like backsliding. The point is not to feel good every day. The point is that the floor rises over time.

People often describe noticing the small things first. Laughing at a show without trying. Looking forward to a meal. Calling a friend without forcing it. Music sounding right again. Those are the early signs of recovery, and they often arrive before mood feels different in any large way.

Recovery is also not a return to the exact person someone was before the episode. Most people return to function. Most return to their relationships and their work. Many come back with a clearer sense of what helps them stay well and what does not.