Jim Campilongo has said that he has done that. One song a day. Sounds like a good simple goal. For me personally I rather focus on what Tommy Emmanuel said, to learn a song for as long as it takes. At the end of the year, I'd like to be able to perform one song instead knowing a riff of some 365.
The problem for me is that it takes a week for me to learn a song. My ears are bad, my timing is terrible, and I don't have multiple hours every day for playing. These the chords, the melody, the riffs those are the main parts to learn, then the possible solos if vital to the song. A lot of stuff to learn, too much for my lack of skills.
This past week or two I've been learning "Summertime". A couple of different progressions, from sheets I have, not by ear. In two keys and playing melody in different different ways. Still not there with it, will get to try it with the band tonight.
Campilongo also said he doesn't really remember the songs afterwards unless he has gigged them.
<- I don't need smileys, I'm smiling already.