UncleBen, what do you like to play?
With 5 hours a day I actually would caution you not to spend them all in big repertoire, as you may risk injury from over-practicing.
My favorite get-back-in-shape diet includes lots of easier works by Chopin (the easier preludes, waltzes, nocturnes and marzurkas, mostly), Mozart and Haydn sonatas, the easier preludes of Debussy and the Suite Bergamasque, and some Schumann (the only truly romantic composer) particularly arabesque, kinderszenen and the first novellette.
If you can get this selection to performance level you will always have something pretty to play and the more challenging works are just around the corner.