As for the length of time it takes, I can understand that each person is different, but I was hoping at some point that some teacher who has been teaching for years might give an average of how long it took for the students to become proficient in tremolo.
Many years ago I could do the 3-finger tremolo, but I had an unfortunate situation that occurred when I changed my right-hand position at which time I lost control of my index finger. It has improved remarkably through the years, but I still feel some lack of precision. The 3-finger tremolo is almost back to normal, but the 4-finger tremolo that I love is still far from accurate. It just seems so unnatural to shift from i to a, and then m i, but when done properly, it is very special.
I live in a part of Virginia where there are no teachers, and I doubt if there are any guitarists outside of country music.
Thanks again for your help.
Worick