Alkan's '12 Minor Etudes' are formidable challenges, pushing the boundaries of piano technique with their dramatic intensity and complex textures. These are not merely studies but powerful musical statements demanding immense virtuosity.
Developing colossal strength and stamina in both hands is paramount for navigating these etudes.
12 Minor Etudes (Op. 39) is rated Henle level 8 of 9 — concert repertoire, roughly diploma level. In the RCM system it corresponds to about level 10.
You should be comfortable at Henle level 8 — meaning you can already play level 7–8 pieces cleanly. Learning it one level early is possible as a stretch piece, but more than that usually leads to months of frustration.
A typical performance of 12 Minor Etudes (Op. 39) lasts about 30 minutes.
12 Minor Etudes (Op. 39) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.