Fast onset, long gentle plateau

2. T+00:15:00 [intensity]

intensity 

± PLUS/MINUS — Threshold — something may be present, but it's right at the edge of perception. A stronger experience would confirm it; otherwise it may be nothing.

3. T+01:15:00 [intensity]

intensity 

+ PLUS ONE — Clearly noticeable. You can tell when it began and how it's changing, though its full character isn't apparent yet.

4. T+10:00:00 [intensity]

intensity 

− MINUS — No noticeable effect.

5. T+00:00:00 [note]

Effects began within fifteen minutes and were fully established roughly an hour later. Open-eye visual changes were minimal, but closed-eye imagery came easily. The experience wound down after about ten hours and the author judged it a solid, repeatable trial.