Not sure if this counts but a week (7days) on shrooms. I did it on purpose as an experiment on myself. That includes waking up tripping and making sure to ingest either tea or dried when appropriate to keep it going. I just wanted to live a week of life in a constant state of awareness through psychedelics. I had that much free time though and no additional responsibilities which made a big dif. (plus food etc.. all covered beforehand). The shrooms were collected naturally so I had a bunch.
... and note: not dicksizing .... just answering the question