Heitor Villa-Lobos' 'Amazonas' is a set of piano pieces evoking the Amazon rainforest, known for its vivid imagery and virtuosic demands. These works are characteristic of his unique blend of Brazilian folk elements and modernist techniques.
These pieces demand mastery of percussive attacks, wide dynamic ranges, and complex polyrhythmic passages.
Amazonas, W118, 119 is rated Henle level 8 of 9 — concert repertoire, roughly diploma level.
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 Amazonas, W118, 119 lasts about 15 minutes.
Amazonas, W118, 119 is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.