5mg of DOM (STP). Be warned: this is not a one-evening commitment. The come-up alone took nearly 3 hours, which is where many people make the mistake of redosing — don't.
Once it arrived, the psychedelic space was unique. More stimulating than LSD, with a distinctly phenethylamine character. Visuals were detailed and geometric rather than flowing. The body buzz was intense — almost too much stimulation at times.
The peak lasted from hours 3-8, followed by a long, slow descent. I was still noticeably affected at hour 12 and didn't sleep until hour 18. The marathon duration is genuinely exhausting, even for experienced psychedelic users.
The experience was profound but the time commitment is the limiting factor. You need to clear an entire day plus recovery time. Set and setting need to be extra robust because you're in the experience for so long. Not a beginner substance.