During the last 5 years, I`ve played Hanon and Czerny. I can play Hanon very fast but when I try to play Mozart or Chopin or Bach, there are a lot of things Hanon or Czerny don`t give me... Chang does not recomend Hanon and Czerny because they are not meant to be performed: "Practicing something that wasn`t meant to be performed is not only a waste of time but also destroys any sense of music you originally had" (Fundamentals of piano practice" - Chuan Chang). Leschetizky recomends Czerny (namely op.740, 399, 337) but not Hanon. By the by, Hanon spends a lot of your time, surely not only one hour to be done. On your case, I think you must leave Hanon. Practice scales, Harps, third scales, trills, etc... and go to Bach Inventions (two voices, of course), Clementi... Dont be the slave of perpetual preparatory exercises. By the way, download the "Fundamentals of piano practice" (Chang) and read it. It`s free download. You may also download, in this Forum, the "Fundamental principles of Leschetizky method" by Marie Prentner. In my humble opinion, both may be very usufull for you.