Well, not that I'm anti-Yiruma (I'm not saying this against Yiruma), but there are more fascinating piano music than his. His are just -- I dunno -- too simple compared to that of Chopin's and other classical masters.
Chopin's actually a lot. You could indulge yourself in 18 hours of Chopins piano music (well, I think that's average, without applauds). His preludes only last for about 49 minutes or so, that gives you 17 hours 11 minutes more to listen to.
Mozart's Piano concertos last 12 hours, continuous. Still incomplete (I lost my CD).
With 86 of Liszt's famous pieces, you can use up 10 hours listening to them.
With Beethoven's 32 sonatas, you can spend up to 10 hours listening.
:D.
Chopin Etudes are fantastic too, with their REAL function neglected because of its enormous musicality (well, compared to Cramer, Czerny, Hanon or so). It'll only spend your 37 minutes (all 27 etudes each of unique musicality and mood) Oh, and his waltzes (lasting for about an hour or so), are also fun to listen to. His nocturnes aren't that as amusing as his other melancholic pieces (sometimes even jumpy) but 2 hours of his Nocturnes can change your mood. 58 Mazurkas (I included the Rondo a la Mazurka) will use up 3 hours.
That's a lot of piano music to choose from . . . Those are just four composers. Consider Rachmaninov, Ravel, Ligeti and others . . .