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Back when my friend and I had an enormous amount of DMT to play around with for next to free, we would occasionally sprinkle unmeasured quantities into joints, and welcomed the roulette-like experience. Sometimes we would get effects at the level you've described, and sometimes between 3 or 4 people, there was enough in one joint for everyone to breakthrough (though when this turned out to be the case, usually everyone else would stop just short of that, and leave the remaining third or half to me, since it's hard to put out a salted joint without wasting what's left of the DMT, and I never had a problem going deeper than planned). Typically, by smoking in the form of a joint, the comeup could be pleasantly lengthened, and it was easy for friends sharing to get off at whatever stop they wanted to peak at. I did not personally notice any significant prolonging of effects from lighter doses, however, reaching heavier or breakthrough doses by this method definitely extended the peak a little bit, and lengthened the post-peak effects and comedown to about 40 minutes. The obvious problems with the "salted joint" routine are that, one, we never measured how much was being used- knowing that the method could be less than efficient, and not worried about using too much- so we were more than likely using unnecessarily large amounts, bringing us to problem number two, that most people don't keep DMT in volumes large enough to be mistaken for playground sand.
The only times I've ever experienced primary DMT effects enduring up to 1 or 2 hours, was when smoked while already on DXM. However, the character of both the DXM and the DMT were completely changed in combination. Ironically, the experience was always far more lucid and alert than either substance alone. And while cleaner and more satisfying than solely DXM, it also lacked the sort of "awe and amazement" typical of DMT or other psychedelics. Instead of the internal chanting of "wow", it was more like a silent "well, obviously". (Though- don't get me wrong- the combo was immensely enjoyable and profound in its own right).
Hope any of this helps.