How Long Does LSD Last, And What Should You Expect During A Trip?
Last reviewed and updated: June 19, 2026.
Key Takeaways
| Typical LSD duration | 8–12 hours total: onset 1–2 hrs, peak 2–6 hrs, tapering 6–10 hrs, residual to 12+ hrs |
| Primary duration factor | Dose — higher doses extend duration (not just intensity); body weight matters less than commonly assumed |
| Clinical trial finding | Post-peak hours 6–10 are now recognized as therapeutically valuable (not just “coming down”) — integration often happens here |
| LSD vs. psilocybin | Psilocybin lasts 4–6 hrs (half of LSD); psilocybin preferred in clinical settings because it fits a single-day session |
| Microdose duration | 5–20 mcg microdose: 4–6 hrs of subtle effects; may interfere with sleep if taken after midday |
How long does LSD last? LSD is known to be a long-lasting psychedelic, but how long a trip lasts for you depends on various factors.
In this guide, we will describe the typical duration of the experience, the factors that may shorten or lengthen a trip, and the effects of LSD.
Peter van der Heyden, the co-founder and chief science officer at Psygen, worked with LSD in an underground lab for decades, and believes there is no such thing as a standard dose of acid.
“Unlike other substances, it has this range of dosage, going from mere micrograms up to what are potential heroic doses, well over a milligram,” he says in the book Psyched: Seven Cutting Edge Psychedelics Changing the World. Consider the different ways people refer to experiences associated with varying doses of acid: a microdose, a “museum” dose, and a macrodose all result in something different.
“When you start getting above 100 micrograms, it has yet a different effect. From there, as the dose increases, we see psychedelic effects involving ego loss, mystical-type experiences, and so on,” he says. “To have specific types of activities across the kind of dosage range, which is orders of magnitude from one dose to another, with measurable and distinct effects at each dosage? That’s astounding.”
Peter van der Heyden
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How Long Does LSD Last?
Typically, an LSD trip will last for about 8-12 hours. But this needs some further explanation. A 12-hour LSD experience does not mean that you will be having full-blown psychedelic effects from the moment you ingest the drug and then for 12 hours.
As with other psychedelics, LSD has an onset, come up, peak, offset, and after effects. The after effects, however, are those remaining feelings that linger when the trip is over. We will not count those here as part of the duration of an LSD trip.
Let’s go through these different stages of the LSD trip, highlighting how long they last and what you can expect to experience during them.
Onset
This refers to the time it takes for the first effects of the drug to appear. For LSD, this is 15-30 minutes. After this amount of time, you might notice a change in your body, such as stimulation, some slight nausea, or a tingling sensation in some areas.
Come Up
The come up is the stage between the onset and the peak. It is where the intensity of the experience will build. This stage lasts 45-90 minutes. During the come up, you will likely notice an increase in the intensity of physical, emotional, and perceptual effects.
It is common during the come up to experience an increased sense of humor and laughter. It is also normal to feel some anxiety during this stage.
Peak
This is the stage when you experience the greatest intensity of effects. This stage lasts 3-5 hours. The peak effects of the drug will vary according to many factors, so it is hard to say precisely what you will experience during this stage. However, with a typical dose of 100 micrograms (mcg), you can experience the following.
- Distortions in the outside world, such as objects morphing and “breathing”
- Enhancement of colors
- Fits of laughter
- An increased appreciation for music
- Positive emotions like joy, euphoria, awe, and gratitude
- Negative feelings like anxiety, fear, and confusion
- Stimulation, making you want to move around
- Insights and lessons
Offset
The offset can be thought of as the “coming down” stage. This is when the psychedelic effects diminish. This can last 3-5 hours. During the offset, you can expect the visual and auditory effects to be less intense. The decreasing stimulation may also make you want to relax a bit more.
Many people find that the offset — after the peak — can be highly introspective. At this point, you may find yourself “looking inwards”, thinking about topics, yourself, and your life from different angles. During this stage, you may also start to reflect on what you experienced during the peak.
As mentioned before, the after effects of LSD are not part of the trip, per se, since they don’t involve classic psychedelic effects like perceptual changes, intense emotions, drastic shifts in emotions, and deep introspection.
However, you may experience some fatigue and an “afterglow”, which is a lingering feeling of contentment and well-being. After effects can last 12-48 hours, although the afterglow can last much longer than this.
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The Length Of An LSD Trip Can Vary
While 12 hours is considered normal for the length of an LSD trip, the actual duration can vary, sometimes significantly. Let’s explore what factors can influence this.
LSD Dosage
The LSD dosage you take can play a big role in how long the experience lasts. If you take a low dose (such as 50mcg), then you may find that the subjective effects of the experience pass after eight hours. If taking a moderate dose of, say, 100mcg, then a 12-hour experience can be expected. When you ingest large doses of LSD, the experience can last longer than this.
For example, it is possible to experience psychedelic effects for up to 24 hours, if you take a high enough dose.
You should think about the relationship between dosage and duration before deciding on what dose of LSD to take. Are you prepared to have a 12+ hour LSD journey?
Drug Combinations
If you combine LSD with certain other drugs, it is possible to extend how long the psychedelic effects last. For instance, cannabis is known to interact synergistically with LSD. This means that it increases the intensity of LSD’s effects. This is something you should be aware of before trying this combination.
You should also keep in mind that on the tail-end of an LSD trip, you can effectively kickstart the trip back into action by consuming cannabis. This may result in the trip lasting longer than it otherwise would have.
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How To Consume LSD
When taking a blotter tab of LSD, it’s common practice to put the tab on or under your tongue and to leave it there during the onset, swallowing it after 30 minutes or so. This makes the compound enter your system quicker than if you swallowed the tab.
If you have a full stomach before swallowing it, this could further extend the time it takes for the trip to start. However, swallowing the tab rather than letting it sit on your tongue will just extend the onset and come up, and not by much.
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How Long Does LSD Last Compared To Other Psychedelics?
LSD lasts much longer than other psychedelics, but it is not the longest-lasting one (assuming we are comparing similar dosage levels). If the length of an LSD trip is off-putting to you and you would struggle to commit to it, there are, fortunately, psychedelics that involve a more manageable timeframe.
On the other hand, you might enjoy long psychedelic experiences and would like an even longer trip, in which case another long-lasting compound might appeal to you.
Shorter Lasting Psychedelics
- DMT: 5-30 minutes
- 5-MeO-DMT: 10-45 minutes
- Salvia: 10-30 minutes
- Ketamine: 30-60 minutes
- Ayahuasca: 4-6 hours
- Psilocybin Mushrooms: 4-6 hours
Longer Lasting Psychedelics
- Mescaline and Mescaline-Containing Cacti: 10-18 hours
- Ibogaine: 24-30 hours
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How To Prepare For An LSD Trip
LSD is known to be a long-lasting psychedelic. Even when the trip is over, there can still be lingering feelings of stimulation, which, depending on when you took it, may make it difficult to sleep. You need to be prepared for the duration of the LSD experience.
This might mean taking the following into account.
- If you want to ensure you can get a good night’s sleep when the trip is finished, make sure to take your dose early in the day. By doing so, you will give yourself time for any stimulation to wear off, allowing you to fall asleep naturally.
- If you can’t (or don’t want to) take LSD early in the day, you can take other steps to help you fall asleep when it gets to your normal bedtime. This might include meditating, having a hot bath or shower, or using sleeping aids.
- Make sure you have at least a full day to have the experience (ideally, you should have the day after free as well, giving you time for integration). Since LSD can last 12 hours or longer, you don’t want to have any obligations to attend to.
- If you are not in the mood for an experience that is longer than 12 hours, then don’t take a strong dose and don’t re-dose during the trip.
- If you prefer to have a shorter experience, take a low dose of LSD.
- As an LSD trip can last a long time, you want to ensure you have enough to keep you occupied during that time. Some activities that can enhance the quality of the experience are listening to and playing music, walking, drawing, journaling, and watching films.
One of the best ways to prepare for LSD is to accept and embrace how long the experience will last.
What Research and Clinical Trials Tell Us About LSD Duration in 2025
Since this article was first written, LSD has moved meaningfully into formal clinical trial settings — and that research has added precision to what we know about how long LSD lasts and why dose matters so much for duration.
Clinical trial dosing data. Most current LSD clinical research uses doses in the 100–200 mcg range. MindMed (Mind Medicine Inc.) has been running LSD-assisted therapy Phase 2 trials for anxiety disorders using 100 mcg as the primary dose. MAPS and independent groups have explored 75–200 mcg for various indications. Consistently, these trials report that the acute experience lasts 8–12 hours at therapeutic doses — consistent with the range described in earlier user reports and confirming that clinical and recreational dose experiences share a similar timeline. Importantly, the therapeutic window appears to fall in the 6–8 hour active-experience phase, with a 2–4 hour tapering period that researchers now characterize as part of the therapeutic process rather than “just the tail end.”
The clinical importance of the full timeline. Controlled clinical settings now use the full 8–12 hour window intentionally — therapists do not expect or attempt to “wrap up” the therapeutic work in the peak phase. The post-peak period (roughly hours 6–10) is now recognized as particularly valuable for integration, when patients can reflect, articulate, and begin to process insights from the peak. This is a shift from earlier clinical models that treated the post-peak as merely “coming down.” If you’re planning your own experience, this framing is useful: the later hours are not wasted hours.
Microdosing duration is a different question entirely. Sub-perceptual microdoses of LSD (typically 5–20 mcg) produce effects that last 4–6 hours — substantially shorter than full doses, because you’re not hitting the full agonist activity at serotonin 2A receptors that drives the extended duration. Fadiman Protocol adherents typically dose every third day, which means the 4–6 hour effect window does not interfere with subsequent days. This is relevant because many people overestimate how long a microdose will affect them and plan their day accordingly.
Frequently Asked Questions
How long does an LSD trip typically last?
Most LSD experiences last 8–12 hours, with the peak effects typically occurring 2–5 hours after ingestion. The early phase (hours 1–2) involves onset and ascending effects; the peak phase (hours 2–6) involves maximum perceptual, cognitive, and emotional intensity; the tapering phase (hours 6–10) involves gradual resolution; and a residual phase of mild effects can extend to 12+ hours for some people. At doses above 150 mcg, the total duration often extends toward the longer end of this range. Clinical trials using 100–200 mcg doses consistently report 8–12 hours of meaningful effects.
What factors make an LSD trip last longer or shorter?
Dose is the most significant factor — higher doses produce longer durations, not just more intense peaks. Individual metabolism plays a role; people with faster hepatic metabolism may experience shorter durations. Body weight has less effect than many people assume. Taking LSD on an empty stomach generally accelerates onset but does not substantially change total duration. Tolerance develops rapidly with repeated use — daily use produces near-total tolerance within 3–4 days, meaning the same dose lasts significantly shorter and feels less intense. Cannabis used during an LSD experience is well-documented to intensify and sometimes extend effects, particularly in the peak phase.
What’s the difference in duration between LSD and psilocybin?
Psilocybin experiences typically last 4–6 hours — roughly half the duration of LSD at comparable intensity doses. This is one reason psilocybin is sometimes preferred in clinical trial settings: the experience fits within a single therapeutic session of 6–8 hours, whereas LSD requires a full day commitment. For recreational users, LSD’s longer duration means more careful scheduling is needed — starting an LSD experience late in the evening carries real risk of the peak falling in early morning hours when sleep becomes important. Psilocybin’s shorter duration makes timing logistics somewhat simpler.
How long does a microdose of LSD last?
A sub-perceptual microdose of LSD (typically 5–20 mcg) produces subtle effects lasting roughly 4–6 hours. Unlike a full dose, the effects should not be perceptible as an “experience” — if you notice significant mood shifts, perceptual changes, or difficulty concentrating, the dose is likely too high for sub-perceptual microdosing. The Fadiman Protocol (dosing every third day) is designed around this window: the microdose effects are active on day 1, fully resolved by day 2, with day 3 as a clear baseline before the next dose. Some people find even sub-perceptual LSD activating enough to interfere with sleep if taken after midday.
