LSD, or lysergic acid diethylamide, is a powerful psychedelic drug that can produce intense visual and auditory hallucinations as well as a range of other psychological effects. The duration of a trip on LSD can vary depending on a number of factors, including the individual's metabolism, body weight, and tolerance to the drug, as well as the amount of LSD taken and the method of ingestion. Typically, a trip on LSD can last anywhere from 6 to 12 hours. However, some users have reported trips lasting for as long as 24 hours. It's important to note that the effects of LSD can be unpredictable and can vary greatly from one person to the next, so it's difficult to say exactly how long a trip on LSD will last for any given individual.