Thank you all.
I've been working on a Mozart sonata, a Shubert impromtu, a Bach fugue, Czerny exercise, and mastering the scales. I've found that I have developed a clearer sense of what each should sound like, and as opposed to my prior method of just getting through each piece, I work on increasingly smaller and smaller sections attempting to achieve with my fingers that sound in my mind (I am probably expressing this in the worst possible way.) Previously, I could say that I had "mastered" 4 lines of Mozart in a week...now 4 lines of Mozart can take me two to four weeks.
My teacher has told me that to achieve that sound image, I have to either increase my practice time or reduce the number of pieces on which I work.
I think I'll just have to grapple with this. I could never understand how someone could practice to 5 to 9 hours a day...now I can see it. Perhaps what I need to do it to block out time during the day by "task estimate" (I also do a form of freelance so I'm accustomed to "billable hour by task" thinking") and block out my time that way.
Dear "Bernadette":
After many years of being blacklisted due to my video, I finally found (after two unsuccessful tries) a Concerto Coach. The original title of my video should have been: "Your Piano Teacher Is Ripping You Off."
The first two teachers I tried out had a combined 50 years experience and two Masters Degrees, and one with a Bachelors Degree from Eastman attained under her Royal Highness.
So, now I have a DMA Coach, who analyzes each student based on their own individual abilities. Specifically, I have low-level Parkinson's Disease and tend to speed up. Therefore, she is utilizing a very special two note phrase method of "hand drop and separate" slow practice.
The results have been phenomenal.
Because my goal is to memorize my entire Concerto repertoire by the end of next year, I practice no more than the Chopin/Hummel recommended two hours a day. I do two hours in the morning, and then I cheat by doing an additional half hour in the late afternoon.
Once again, the results have been phenomenal.
So, (per the OP) if you want to end up like 99% of the so-called talented pianists who practiced all day and night like Cliburn (who rarely practiced his Juilliard schedule at all in his later years), then go ahead. In a word, you will "burn" yourself out just like the rest of them.
Also, your risk of injury (tendonitis, carpel tunnel, et al) will be greatly increased.
So, (per the OP) if your teacher does not agree with the two hour practice regimen of Chopin, Hummel, and the late Dalies Frantz (student of Rachmaninoff), then get yourself another teacher like mine who sizes-up/analyzes each student based on their own abilities.
Finally, and parenthetically (and I mean as a student of my technique Coach Thomas Mark), quit wasting valuable practice time "warming up" by playing useless scales, broken chords, arpeggios and exercises before you practice. The late Earl Wild wrote extensively in his Memoir that, by and large, this was a huge waste of time.
Accordingly, per the OP, you would be surprised just how much one can accomplish (with a short break in between) in just two hours.