No, I'm not tired of these pieces.
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Back to topic: Work on as many, or as few, pieces you have time to work on. You shouldn't feel that you have a real deadline with a piece (like "okay, if I work on this piece for one hour, and that piece for 45 minutes, and that piece for 1½ and that piece for 25 minutes and that piece...")
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I don't practice like that.
but have time to really do everything you can in every session.
Yeah, that's me

.
Have you learned all the notes? Can you play them at tempo? Do you have dynamic control? Is it memorized well enough to survive a hostile audience? Have you thought about the subtleties of dynamics and timing that are not written in the music (i.e. implied by harmonic structure, phrasing, form, texture, etc.)? Have you made conscious decisions about voicing in all passages? What does almost done mean?
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I'll try to answer all of those things:
Beethoven Piano Sonata "Pathetique" Op.13 (1st mvt.) - Learned all notes and memorized most of it, working a bit on dynamics and the subtleties that are not written in music, decisions about voicing are made
Schubert Impromptu Op.90 No.2 - Learned and memorized all notes except for coda, dynamics are pretty stable, subtleties of dynamics are pretty good, and conscious decisions about voicing in all passages are made
Chopin Scherzo Op.31 - Learned and memorized all notes, working on dynamics, subtleties of dynamics, decisions about voicing are made
Liszt Paganini Etude No.3 "La Campanella" - Learned and memorized all notes, working on dynamics, articulation, and subtleties of dynamics, decisions on voicing are made
Chopin Etude Op.25 No.12 "Ocean" - Just need to increase tempo and have a good line of music