A typical cannabis edible high lasts six to eight hours, with effects peaking around three hours after you eat it. That’s significantly longer than smoking or vaping, which usually wear off within one to three hours. But the full picture is more nuanced: depending on the dose, your metabolism, and how often you use cannabis, the effects can stretch to 12 hours, with residual grogginess lingering into the next day.
The Basic Timeline
Edibles take 30 to 60 minutes to kick in. Unlike smoking, where THC hits your bloodstream through the lungs almost immediately, an edible has to travel through your digestive system first. Some people feel the first effects in half an hour; others wait up to two hours, especially on a full stomach. This slow onset is the reason people sometimes make the mistake of taking a second dose too soon, thinking the first one didn’t work.
Peak intensity arrives around the three-hour mark. THC blood levels are highest at that point, and this is when the experience feels strongest. From there, effects gradually taper. Most people feel largely back to normal after six to eight hours, though higher doses can extend that window considerably.
Why Edibles Last So Much Longer
When you eat THC, your liver converts it into a different active compound before it reaches your brain. This metabolite is also psychoactive, meaning your body is now processing two intoxicating substances instead of one. The conversion takes time, and both compounds clear slowly, which is why the high builds gradually and fades gradually rather than hitting hard and dropping off quickly like inhaled cannabis does.
This liver processing also explains why edibles often feel qualitatively different from smoking. Many people describe the high as more intense and more body-focused, even at comparable THC doses.
How Dose Changes Duration
The amount of THC in the edible is the single biggest factor in how long you’ll feel it. Here’s a rough breakdown of common dose ranges:
- 2.5 to 5 mg THC: Considered the lowest effective dose. Effects are mild and typically stay within the six-hour window. This is the standard starting point for someone new to edibles.
- 10 to 15 mg THC: The average dose in most commercial edibles. Suitable for regular cannabis users who want a noticeable high lasting several hours.
- 20 mg THC and above: Considered a high dose. Effects are stronger and can last well beyond eight hours. The body simply needs more time to process larger amounts of THC.
Individual sensitivity varies enormously. Some people feel clear effects from as little as 2.5 mg, while others need 50 mg to notice anything at all. If you’re trying edibles for the first time, starting at 2.5 to 5 mg and waiting at least two hours before considering more gives you the safest read on your personal response.
Factors That Make Effects Last Longer
Your metabolism plays a major role. Older adults process cannabis compounds more slowly than younger people, which means the high can last longer and hit harder than expected. Stanford Medicine researchers have noted that this slower clearance also increases the chance of interactions with other medications.
What you’ve eaten matters too. A University of Minnesota study on cannabinoid absorption found that taking cannabinoids with high-fat food increased the amount absorbed into the body by four times compared to fasting, with peak blood levels jumping by 14 times. In practical terms, eating an edible alongside a fatty meal (or choosing an edible made with butter or oil) can intensify and extend the experience. Taking one on an empty stomach may produce faster onset but lower overall absorption.
Tolerance is the other major variable. If you use cannabis frequently, your body adapts, and you’ll generally feel the effects for a shorter period at a given dose. Occasional users, on the other hand, tend to experience longer, more intense highs from the same amount.
The Next-Day Hangover
The primary high isn’t always the end of the story. Intoxicating effects can last up to 12 hours, and residual effects, often described as brain fog, sluggishness, or mild grogginess, can persist for up to 24 hours. This means a strong edible taken in the evening could leave you feeling off the following morning. It’s not the same as an alcohol hangover, but it can affect your concentration and reaction time enough to matter.
Driving and Safety Timing
Colorado’s Department of Transportation recommends waiting at least eight hours after eating an edible containing less than 18 mg of THC before driving. If you’ve consumed more than 18 mg, you need to wait longer. Combining cannabis with alcohol extends impairment further, as the two substances amplify each other’s effects. Some products, particularly those from unregulated sources, can cause intoxication lasting beyond 12 hours.
These recommendations are more conservative than those for smoked cannabis (six hours for doses under 35 mg), reflecting the longer, less predictable timeline of edibles.
How Long Edibles Show Up on Drug Tests
The high fades long before THC leaves your body. Drug tests don’t distinguish between edibles and smoked cannabis, so detection windows are based on overall THC exposure and frequency of use. In blood tests, THC is typically detectable for 2 to 12 hours. Urine tests have a much wider range: 1 to 30 days, depending heavily on how often you use cannabis. A single edible from an occasional user might clear urine in a few days, while daily use can keep THC detectable for a month.