Itzhak Perlman advises practicing three hours a day. His practice formula is:

  1. 1 hour on scales
  2. 1 hour on etudes
  3. 1 hour on repertoire

NOTE:

  1. Practice Scales using a hand frame.
  2. Practice Etudes using metronome and being aware of your bow strokes.

Source:: How Many Hours a Day Should You Practice the Violin