I played 3 pieces that where so difficult for me, I needed 3 or 4 months. It was Jeux D'eau, Gnomenreigen, and the 1st Chopin Ballad.
When I played Gnomenreigen, I really didn't enjoyed training it, but after playing it and working on other pieces, I noticed that it made technical wonders!
When I worked on Jeux d'eau, I just had fun. I really enjoyed playing it, because if you play music like this I think mistakes doesn't sound as horrible as in . lets say. Mozart Sonatas
And when I worked on the Chopin Ballad, after 2 months I was really annoyed because I trained hard and harder on the Presto con fuoco part, and I NEVER mastered this page without any mistakes.
My teacher told me that she thinks a piece is too hard TO PLAY IT IN A CONCERT if you need more than 3 months to develop the necessary technic, because she thinks after all you're still not able to play it perfectly. But she also thinks that training on very difficult pieces is good for technic AND for motivation, because if you enjoy playing it, you should just do it.
I totally agree
