Don't concentrate on how you divide the time. Everyone's brain assimilates new information in different ways. You need to figure out which is the best way for you to learn. Do you like to learn a song a bar at a time? If its not complex, maybe a verse at a time? or a chorus? Maybe you like to strum through the basic harmonic structure, and then go back and fill in the blanks.
You are most likely never going to be able to simply sight read ANY piece of music without stopping and thinking and maybe looking at your guitar. Perhaps some pieces though. A good exercise to do is every time you learn a section of music that's say "individual," or stands out as a distinct "flavor," really try to take that concept and apply it in different ways. And when you play it, try to imagine what the sheet music or tab would be.