A THC gummy typically lasts four to eight hours, and the fade is much slower than the climb.
That second part is what catches people out. Everyone plans around when a gummy starts. Almost nobody plans around when it ends, and the tail end of an edible is longer, blurrier, and harder to schedule around than most people expect.
Onset lands 30 to 90 minutes in, peak arrives around two to three hours, and then you come down over the following several hours. Four to eight hours total for a typical dose; ten to twelve isn’t unusual at higher doses.
But “lasts eight hours” doesn’t mean eight hours of the same thing. Roughly, a standard dose looks like this:
Hours 0–2: climbing. Effects building, often faster than you notice.
Hours 2–4: peak and plateau. This is the part people mean when they describe the experience.
Hours 4–7: the fade. Effects clearly diminishing but still present. Most people are functional here but not sharp — this is where you can feel basically fine and still be a genuinely bad idea behind the wheel.
Hours 7+: residual. Tiredness, some fogginess, sometimes a heavy or slightly hungover feeling. Not really “high,” but not baseline either.
That third block is the one that ruins plans. It’s the reason a gummy at 8pm can mean a rough 7am.
Inhaled THC peaks within minutes and is largely done in two to three hours. A gummy runs two to three times as long, and the reason is what your liver does with it.
Everything you swallow passes through your liver before reaching general circulation, and your liver converts a large share of the THC into 11-hydroxy-THC — a related molecule that reaches the brain more readily and hits harder than THC itself. That gives you a second, slower wave layered on top of the first, and it’s why edible duration is measured in a different unit than smoking. I explain the conversion in why edibles hit so much harder than smoking.
Absorption is also gradual rather than instant. Your intestines release THC into your bloodstream over hours, not seconds — so you’re not just clearing one dose, you’re clearing a dose that’s still arriving.
Dose. The biggest factor by far. Duration scales with dose more reliably than onset does. 5mg might be done in four hours; 25mg can run twelve.
Body composition. THC is fat-soluble, so it distributes into fat tissue and releases back out slowly. Higher body fat generally means a longer, flatter tail.
Food. A fatty meal beforehand delays onset, but it also tends to increase total absorption — so a later start often means a later finish, not a shorter one.
Metabolism and genetics. The liver enzymes doing the work vary considerably between people. Same gummy, same conditions, meaningfully different durations.
Tolerance. Regular use lowers intensity but doesn’t shorten duration nearly as much as people assume. You may feel less and still be affected just as long.
Format. Fast-acting or nano-emulsified gummies often run shorter as well as starting sooner. Standard gummies sit in the middle; fatty edibles like brownies run longest.
Count backwards from when you need to be normal. If you need to be sharp at 8am, a substantial dose after 8pm is a bad trade. Working forward from “when do I want to feel it” is how people end up wrecking the next morning.
Don’t drive for the rest of the day. Not just until you feel okay — impairment outlasts the obvious effects, and the fade phase is exactly when people misjudge it.
Expect the tail. If you’re new to a dose, assume the residual phase exists and leave room for it. It’s much easier to plan for than to be surprised by.
Nothing meaningfully speeds it up. Water, food, coffee, cold showers, and walking around will make you more comfortable and more alert. None of them clear THC faster. Time is the only mechanism.
Four to eight hours for a typical gummy, longer at higher doses, with a slow fade and a residual phase that outlasts the part you’d call “high.” Dose is the biggest lever you control; body composition and food do most of the rest.
Your own number depends on all of those together, which is why a general range is only ever half an answer. That’s what GummyClock (gummyclock.com) is for — enter your details and your dose and it maps your actual curve, including when you should be mostly cleared, as a real clock time. If you’ve got somewhere to be tomorrow, that’s the number worth knowing before you eat it.
Get a personalized timing prediction for your next edible.
Open the GummyClock calculator