I have many that are just quick flashes of realizing what I am seeing is only a dream, so perhaps 30 seconds or so. I often have around 5 minutes or so of good lucid stuff. On some less common occasions 20 minutes is easy enough. Perhap 20 times a year I am lucid virtual the last half of the night. I watch transitions in sleep phase and o in and out of REM lucid. Some of the actual dream sequences stretch 60-90 minutes.


How long? Maybe lifetimes, but at least 7 or 8 years before 30 minute ones became likely, and maybe 15 years for the longer ones.