Onset and duration: the two-hour rule
How long edibles take to work, how long they last, what changes the timing, and why the rule on every recipe is one portion and a two-hour wait.
Why edibles are slow
Inhaled cannabis reaches the bloodstream through the lungs within minutes. Eaten cannabis has to be digested and absorbed, then passes through the liver, where THC is partly converted to 11-hydroxy-THC before it reaches the brain. That route is slower to start, longer to last and, for many people, stronger per milligram. It is also why the most common mistake with edibles is taking a second portion before the first has arrived.
What public health guidance says
| Source | Onset | Peak / full effect | Duration |
|---|---|---|---|
| Health Canada (edible cannabis consumer information) | 30 min – 2 h | up to 4 h | up to 12 h, with some effects possible for 24 h |
| US CDC (Cannabis and poisoning) | 30 min – 2 h | — | longer than smoking or vaping |
Those are population ranges. Your own timing depends on what else is in your stomach, body weight, how often you use cannabis, and the form: a drink or a tincture held under the tongue may begin sooner for some people, a dense brownie after dinner later. None of this is reliable enough to shorten the wait.
The two-hour rule
Every recipe on this site carries the same instruction: one portion, then wait two hours before deciding whether to have another. Two hours covers the upper end of the typical onset window. If nothing has happened at two hours, it may still be coming; a second portion then is a judgement call, and for a first-timer the better call is to stop for the evening and use a 5 mg portion next time.
Things that change the timing
- Empty stomach: faster and often sharper onset. Eat the portion with or after food for a gentler curve.
- Fat in the meal: can increase absorption, so a 5 mg portion after a rich dinner may feel like more.
- Alcohol: increases THC blood levels and impairment. Do not combine them.
- Regular use: tolerance shortens and softens the experience; it does not make the onset faster to arrive.
- Drinks: often assumed to be fast. Some products are formulated for faster onset; the homemade drinks here are not, so treat them like any other edible.
Plan the evening, not the hour
Because effects can last six to twelve hours, do not eat an edible if you need to drive, work or look after someone later that day. Plan it for an evening at home, eat it early enough that you will be asleep before it fully wears off if that matters to you, and keep the rest of the batch put away so a second portion is a decision rather than a reflex.
- Health Canada, consumer information on edible cannabis (onset 30 minutes to 2 hours, up to 4 hours to full effect, lasting up to 12 hours), canada.ca: What you need to know if you choose to consume cannabis; and Cannabis: lower your risks, canada.ca/…/lower-your-risks.html. Accessed 2026-11-14.
- US Centers for Disease Control and Prevention, Cannabis and poisoning (edibles take 30 minutes to 2 hours to produce effects), cdc.gov/cannabis/health-effects/poisoning.html. Accessed 2026-11-14.
