> ...could remember absolute pitches for the whole 1.5 hour session; if we came back to a note, she could get it, but she was usually lost in the beginning of t

> ...could remember absolute pitches for the whole 1.5 hour session; if we came back to a note, she could get it, but she was usually lost in the beginning of the session when we came in cold. > had a pitch memory of about 5-10 minutes - while we were working on a specific interval, I could remember and reproduce the base note without being prompted by the piano, but once we moved on to another interval I'd lose it. This is really interesting! Did either of you ever try a spaced-repetition-style approach? It seems like you've basically described the shapes of your respective forgetting curves — I wonder what would happen if you tried to train with the specific goal of extending that window, rather than just noting what your window is during other training. Maybe it's possible to work your way up to long-term perfect pitch in this way? Especially in your case, since you already have data that your window of 5-10 minutes could extend to 1.5 hours, it seems quite doable. I wonder what would happen if you'd spent an extra 30 minutes/day for a few weeks just on this — e.g., focus on remembering 10 minutes out the first week, then 12-15 minutes the next week, etc...