How Long Does Depression Last? Why the Answer Isn't One Number

If you’ve been feeling low for weeks, there’s one question under all the others: when does this end? You want a number, a date you can hold onto. The honest answer depends on a few things you can see clearly, and some of them you can change.

Depression usually comes in episodes, stretches with a beginning and, for most people, an end. How long an episode lasts depends on how severe it is and whether other conditions are tangled up with it, and whether it fully clears shapes how long your recovery holds. Predicting your own timeline takes precision about which of those patterns you’re in.

The standard approach is to treat the episode until symptoms lift, usually with an antidepressant, therapy, or both, and then keep going for a while. That last step matters. In a 31-trial review by Geddes and colleagues, covering 4,410 people, continuing an antidepressant after improvement cut the odds of relapse by about 70% compared with stopping. The results are real, and the science is well established.

But an episode ending isn’t the same as depression being done, and at Siggy we’d rather watch how your recovery holds over months than call it finished when the worst weeks pass.

This guide covers how long episodes usually last with and without treatment, why some linger for years, what drives recurrence, and what a complete recovery looks like. How long depression lasts comes down to its course over time, and that course is well documented in the evidence.

What This Page Covers

• How Long Does a Depressive Episode Usually Last?
• Does Depression Go Away on Its Own?
• Why Do Some Depressive Episodes Last So Long?
• How Does Treatment Change the Timeline?
• Will Depression Come Back?
• What Does a Full Recovery Look Like?
• How Siggy Fits In
• The Bottom Line on How Long Depression Lasts
• Start Your Anonymous Intake

How Long Does a Depressive Episode Usually Last?

A typical episode of major depression lasts about three to four months, though the range is wide. In a national survey of 9,090 U.S. adults, 6.6% had major depression in the past year, and the average episode lasted 16 weeks. Most of those episodes weren’t mild, either: about half of past-year cases were rated severe or very severe. A 23-year Baltimore study that followed residents over time found a median episode length of 12 weeks.

Averages hide a long tail. In a Dutch population study of new episodes, half of people recovered within three months, but nearly 20% still hadn’t recovered after two years.

Here’s how recovery built over time in that study, alongside estimates for depression that went untreated.

Time Since Episode Began	Recovered, Dutch Population Study	Remitted Without Treatment, Pooled Studies
3 months	50%	23%
6 months	63%	32%
12 months	76%	53%

The untreated column comes from a 2013 meta-analysis of 19 studies, with estimates based on untreated adults recruited from primary care. The two studies measured different groups in different ways, so the columns show two views of recovery over time rather than a head-to-head comparison.

Does Depression Go Away on Its Own?

It sometimes does, mostly when it’s mild. The 2013 meta-analysis estimated that among untreated adults from primary care, 23% remitted within 3 months, 32% within 6 months, and 53% within 12 months. The authors note their samples likely leaned toward mild to moderate depression and that the findings may not apply to severe depression.

Put another way, about half of people in those studies were still depressed a year later. Waiting also seems to carry a cost. In a 2014 meta-analysis on untreated illness, a shorter stretch of untreated depression was linked to better odds of responding to treatment and reaching remission, especially for a first episode, though only three studies could be pooled.

If you’ve been telling yourself to give it a few more weeks, that’s a very human instinct. It helps to know that waiting is a gamble with real odds attached.

Why Do Some Depressive Episodes Last So Long?

Some episodes run longer because of what’s riding along with them. In the Dutch study, more severe depression and co-occurring dysthymia, a milder but long-lasting form of depression, predicted episodes that persisted. In the Baltimore study, women tended to have longer episodes than men.

Other conditions matter too. In the STAR*D study of 2,876 outpatients taking citalopram, longer current episodes, more co-occurring psychiatric conditions such as anxiety disorders, and more general medical conditions were all linked to lower remission rates.

When depression lasts two years or longer, researchers, including the Dutch team, consider it chronic. Clinicians now group these long-running patterns under persistent depressive disorder, and a 2020 review in Lancet Psychiatry describes it as common, often more disabling than episodic depression, and easy to miss until it worsens. If low mood has felt like your baseline for years, our guide to persistent depressive disorder explains what that diagnosis means.

How Does Treatment Change the Timeline?

Treatment works, but it takes patience. In the STAR*D study, 47% of people responded to their first SSRI, and 28% to 33% reached remission. A substantial share of the people who responded or reached remission did so at or after eight weeks of treatment.

That timing matters because it’s easy to give up too soon. If you’re a few weeks in and wondering whether anything is happening, our guide on how long antidepressants take to work walks through what to expect, and our eight-week decision path covers what to do if your first medication isn’t enough.

Getting adequate care is its own hurdle. In the national survey, about half of people with past-year depression received treatment, but only about 42% of that treatment met basic standards of adequacy, so roughly 1 in 5 people with depression were adequately treated.

The bigger delay is often getting started. A treatment delay analysis from a national U.S. survey found that people with mood disorders who eventually sought care waited 6 to 8 years after symptoms began.

Will Depression Come Back?

Depression doesn’t always come back, and that’s worth hearing. In the 23-year Baltimore study, about half of people who had a first episode recovered and never had another one. About 35% had a recurrence, and 15% never had a full year free of depression.

Recurrence is more common in people treated in specialty care. A recurrence systematic review found that in specialized mental health settings, 60% of people had a recurrence within 5 years and 85% within 15 years, compared with 35% over 15 years in the general population. The strongest predictors were the number of previous episodes and leftover symptoms after recovery.

Recurrences don’t necessarily get longer. In the Dutch study, a recurrent episode actually predicted a shorter duration than a first one.

What Does a Full Recovery Look Like?

Full recovery means feeling like yourself again, with symptoms gone rather than just quieter. That distinction has real consequences. In a 10-year study of people treated at five academic centers, those who recovered with lingering low-level symptoms relapsed to their next major episode about three times faster than people who recovered fully, a median of 23 weeks compared with 68. Lingering symptoms predicted early relapse more strongly than a history of many past episodes did.

Staying on treatment after you improve also protects you. In the Geddes review, relapse rates were 18% for people who continued their antidepressant and 41% for people switched to placebo. Most of those trials lasted about a year.

If you’re feeling better and thinking about stopping, talk with your prescriber first. In a 2024 meta-analysis of 79 studies, 31% of people who stopped an antidepressant reported discontinuation symptoms, compared with 17% after stopping a placebo. After accounting for that placebo effect, the authors estimated about 1 in 6 or 7 people get discontinuation symptoms, and about 3% of people who stopped an antidepressant had severe symptoms. That’s a good reason to plan any change together rather than stopping on your own. Our guide on how to taper off Lexapro shows what a supervised plan can look like.

How Siggy Fits In

One of the hardest parts of depression care is the space between appointments. Many people describe it the same way: “No one checks in to see if it’s actually working.” That gap is where early stops, lingering symptoms, and quiet relapses tend to hide.

Siggy starts with a free, anonymous intake, with no name or email required. A licensed prescriber reviews your intake before anything is prescribed, and you get a summary you can keep and share with any clinician. Siggy’s licensed prescribers diagnose and treat the full range of mental health conditions, and once you’re on a plan, Siggy combines human clinicians with AI therapy and daily check-ins to stay with you between appointments, so a stretch of feeling better is a reason to talk with your prescriber rather than a reason to quietly stop.

If your history points to something beyond depression, your prescriber can look at that too and talk through what kind of care fits best.

This article is for education and isn’t a substitute for care from a licensed clinician.

The Bottom Line on How Long Depression Lasts

Most depressive episodes last a few months, but a meaningful share last a year or more, and milder cases are the ones most likely to lift on their own. Treatment helps, though it often takes eight weeks or longer to show its full effect. The goal is a complete recovery that holds, which means clearing symptoms fully and staying on treatment long enough to protect against relapse. If you’re unsure whether what you’re feeling is depression or a rough patch, our guide to depression vs. sadness can help you sort it out.

Start Your Anonymous Intake

If you’re in crisis or thinking about harming yourself, call 911 or call or text 988 first. If depression has been hanging on longer than you expected and you want a prescriber to look at your whole history, start your anonymous intake. It’s free, there’s no name or email required, and a licensed prescriber reviews your intake before anything is prescribed. A real doctor reviews everything, and your summary is yours to keep.