Oscillators like the Stochastic 14,3,3 or the Williams %R, just to name a couple, are famous for staying overbought or oversold for long periods of time, but I've never seen nor heard of that happening with extreme readings in investor psychology. Days, yes, months, no. I'd equate the fear/greed index with FOMO, which is usually associated with a pump, and as those closely involved in crypto well know, they don't usually last long. The oscillators, on the other hand, that stay at overbought for an extended period of time, reflect a more sustained, plodding growth that happens consistently, but with much less of a rising angle on the chart (the inverse with the oversold situation), in which the fear/greed index extremes will appear multiple times in the form of price peaks and BTFDs. ;-)