It didn't take more than one month of solfege practice to be able to look at any chord or note on the grand staff in traditional western notation and be able to say what the chord is, what the intervals are, etc.

I still practice the piano 2 hours/day most days. The challenge of playing music isn't reading the notes, it's getting from one note to the next one. 99% of what I practice is simply hand positions, grouping notes, fingerings, voicings. Reading notation is such a trivial part of musicianship, mastered easily with just a few months of study.