It really depends on your aims, but the more, the better. In any case, the nature of your lessons would change over the years. In time you will no longer need any suggestions on which Bb fingering to use or comment on whether you are playing all the accidentals correctly, but you will want to know how the piece is played to best advantage, i.e. dynamics and expression will become more and more important. And later, if you stick it out, the lessons could even be in the form of participation in master classes. The question doesn't turn simply on quantity. Half an hour of high-quality advice is better than two hours of messing around with the instrument. Remember also that teaching well has to be learned like everything else. That's why you see the comment "a pass at this level does not necessarily imply teaching ability" in some music syllabuses.
Someone mentioned the proposition that 10,000 hours are needed for the attainment of expertise. That of course is 10,000 hours of playing, and it would include lessons (a relatively small share), practice (by far the largest share) and playing in ensembles, etc. Also, this target would bring you to the level where you could expect to make full-time (or at least good part-time) living from your music. In other words, you would be an expert and not just an enthusiastic or talented dabbler.
Hope this helps.