SWIM is used by people who don't want to say "I" inferring that someone other than themselves is talking or being talked about. We don't really use it here because it's rather pointless. Most people who SWIM at the Nexus haven't been here too long.
Many people prepare and smoke changa which has the smoking of the MAOI built into the experience. Many people swear by this route, but it does slightly alter the character of the experience, and I typically preferred to see DMT for itself. I guess I'm what you could call more of a purist. How much longer it lasts is going to in part depend on the dose of the MAOI, the dose of DMT, how the MAOI was administered, what the time interval difference is between consumption of MAOI vs. DMT, and sometimes just plain randomness and "luck" it should seem.
When MAOIs are at play, there tends to be something of a delayed start. Whereas normally smoked DMT may come on within five seconds of inhalation, that may be expanded to 20-30 seconds. Herein lies a certain danger of going to smoke more when all you really needed to do was wait. It could be twice as long, could be less and could be more. When you have a breakthrough experience, these can tend to be drawn out a bit more. The longest experience I think I ever had was 40 min, and that was something of an exceptional peak experience in life. I stopped using MAOI with smoked experiences after a very cooky encounter with a bizarre entity. Of course the MAOI could have had little to do with it, and that fellow may have shown up if I simply smoked DMT, but it spooked me a bit.
"Science without religion is lame. Religion without science is blind" - Albert Einstein
"The Mighty One appears, the horizon shines. Atum appears on the smell of his censing, the Sunshine- god has risen in the sky, the Mansion of the pyramidion is in joy and all its inmates are assembled, a voice calls out within the shrine, shouting reverberates around the Netherworld." - Egyptian Book of the Dead
"Man fears time, but time fears the Pyramids" - 9th century Arab proverb