OK, seriously now...

like many here I am not a professional musician so the time I can devote to music is limited and I have to administer it well. In the past I used to study music theory or practice scales, but right now I try to focus my practicing time having a well defined goal in mind, like recording a given song. I have seen that focusing on a thing like this one motivates me a lot more than just practicing scales for the sake of improving my chops.
To give an example, before recording Desafinado I listened to a lot of different recordings and read also different transcriptions of the song, each one with slightly different chords/harmonic progressions, trying to choose the ones that sounded best to my ears, and this IS indeed practice.
Likewise, in my next song I would like to play a guitar solo in the style of George Benson, so right now I am listening to a lot of Benson's recordings and analyzing transcriptions of his solos.

Since I am not a young boy anymore, I have no chances of developing the kind of finger dexterity or hand independence required to play classic stuff or jazz stuff the way Art Tatum or Oscar Peterson did, but I would like to learn two things:
1- develop harmonic skills that allow me to lay down tasty chords with a jazzy flavour in my songs
2- develop melodic/improvising skills that allow me to improvise harmonically, i.e. following the chord changes of a song, albeit not at super-fast tempos.
I will consider myself a fulfilled amateur musician if I succeed in these two tasks.