How long does a medical high last?

A weed high usually lasts between 1 and 6 hours. The time varies depending on how a person ingests the product, along with other factors. After you get high for inhaling marijuana, expect to stay in place for about an hour or two. If you've eaten cannabis, your high will last 3 to 4 hours, maybe longer. A weed high usually lasts between 1 and 6 hours. The time varies depending on how a person ingests the product, along with other factors. After you get high for inhaling marijuana, expect to stay in place for about an hour or two. If you've eaten cannabis, your high will last 3 to 4 hours, maybe longer.