Are there any established and scientifically backed-up facts about what is possible, and what time it takes for ear training? Any studies out there that look at these questions? Like letting people learn intervals and evaluate their progress?
Background: Since almost one year I am doing ear training on a regular basis, approximately 20-30min every day. But my improvement is very slow. I saw people hearing a song and able to figure the harmony and melody out almost instantly, and ultimately thats my goal too.
So, I ask myself, if I continue will I ever, and when will I, reach this goal. Now by any objective measure I am still really far away. My slow progress makes it difficult for me to evaluate myself and having a realistic prospect on my own progress? So, I am looking what science has to say about it.