DMT has been described by many as the most potent psychedelic on the face of the planet. It catapults the user into vivid visual hallucination, completely unhinges any sense of time, and can reveal deeply meaningful/powerful insights about the very nature of reality itself. It's also commonly reported to encounter beings (who are benevolent in nature) during a DMT experience.
While DMT is the most potent psychedelic out there, it's also one of the fastest acting when smoked or vaporized. Smoking or vaporizing DMT will elicit an experience between 15-20 minutes in duration, however during this experience you may completely forget that time exists at all.