Consider your schedule and your priorities. If you are an adult and you are responsible only for yourself then you can decide on your strongest mental time. If you are a younger person then you are at the mercy of the other persons in your home. Whatever time you have, I encourage you to set small, manageable goals and practice phrase by phrase. Look for a phrase and master it. Even memorize it. Consider learning music not note by note but phrase by phrase. Sing to yourself whenever possible-learn some scat. This is a non-verbal language so grunting is allowed. Finding time to grunt musically is key.
I enjoy practicing first thing of a morning. Then, I leave the music open and sit down a couple more times throughout the day. However, if you attend school or leave for several hours at a time for work you can still leave your music on the stand and sit down at the piano when you get home and again before you sleep. But beware: you might dream about music. Not such a bad dream.
For the last 2 days I have been playing the First Movement. One page per day and gradually speeding it up. This movement seems rather sporadic in its form. Granted, this was Mozart’s first published Sonata-1774. It has the markings of experiment and short 4 measure phrases. It is almost as if Mozart had a few ideas and decided to put them all in this movement at various intervals. It is not melodious or seemingly well thought out. This is not a difficult piece to learn though the trills in measure 14-15 could be tricky to fit in once the tempo is up. Lots of arpeggios, scales, and trill practice. On a technical level I think it is a fine starting Sonata for an early advanced student.
I find this to be a more beautiful, flowing piece than the Allegro. It seems much less cut and paste and more of a big-picture composition. It fits under the hands nicely as opposed to the randomness of the Allegro. A nice surprise.
A piano student emailed me recently, wondering if I knew the Mozart Fantasy in D minor, K 397. I looked it up and indeed I had heard it but, never learned it. After a few days of enjoyable sightreading I realized that a Mozart reading project would be beneficial to my fingers and mind. Also, the book, Sonatas and Fantasies for the Piano, Edited by Nathan Broder, has 332 pages. Or, almost a page per day for a year. So, the goal is to play a page of Mozart each day, review the previous pages of the Sonatas and Fantasies until I have learned all of them. I hope to finish this project within a year.