I usually practise for 4-5 hrs, this is how my schedule looks like45 mins-1hr: Bach Partita No.2 in c minor(Sinfonia) or Mendelssohn Rondo Cappriccioso1 hr : Haydn Sonata in E flat major No.49 or/and Beethoven Sonata in A major Op.2 No.2 or 2 hrs:both30-45 mins: Technique including scales,3rds,6ths,fomular pattern,chromatic scales,solid chords,broken and alternate chords, appegios,broken octaves and broken chromatic octaves30 mins: Rachmaninoff prelude in G sharp minor Op.32 No.12 or 1 hr: Chopin Etude Op.10 No5 "Black Key" and Chopin Etude op.25 No.9 "Butterfly"1 hour: Chopin Etude in F major Op.10 No.8 or 95 mins: Schumann Concerto in a minor Op.54my advice is that you leave at least 30 mins for technique everyday or at least every 2 days
1.37mins - Scalesthen neighbor complains, and practice stops.