Do you mean that when you have reached grade 5, you have reached 1/5 of the level required to reach the ballades, or do you mean that you have 1/5 left, that you have reached 4/5 already?
MUSIC ISN'T ABOUT FRACTIONS AND LEVELS! go practice. Aren't you the guy who wants to turn pro in the next 3 years?
hmm. Well, regardless. Music isn't about fractions and levels. There is no 'level' required to reach the Ballades. You can print out the music, and butcher it whenever you feel like it. If you like music, practice every day, and don't worry about 'how many years' and 'what level am I at' and 'how much time do I need to go up a level'? A person who loves music does not ask these things. If you do not love music, do not play music.
When queried, he simply answered - " I lost the feel for the piece; it has just become another ordinary piece ... maybe someday". I was disappointed.