Schubert's 'Heliopolis I' (D. 753) is a setting of a poem by Johann Wolfgang von Goethe for voice and piano. It is not a sonata movement, but a through-composed Lied.
Requires clean articulation and precise execution of rapid passages in the right hand.
Aus 'Heliopolis' (I)(Op.65 No.3) (D.753) is rated Henle level 6 of 9 — advanced repertoire, roughly ABRSM grades 7–8. In the RCM system it corresponds to about level 7.
You should be comfortable at Henle level 6 — meaning you can already play level 5–6 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 Aus 'Heliopolis' (I)(Op.65 No.3) (D.753) lasts about 2.5 minutes.
Aus 'Heliopolis' (I)(Op.65 No.3) (D.753) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.