If I were to dedicate 30 minutes of practice per day to only the physical aspects of playing (speeding up my scales and arps.), what kind of progress should I expect? I'd rather not hear that it's different for every person, etc., but rather, what kind of progress have you made (like in B.P.M. for eighth notes) on such things as scales, chromatic runs, arpeggios, etc and how much time per day (average) did you put into it?