30 minute practice that might make all the difference.
5 minutes: start with a warm up to warm your fingers up.
10 minutes: do your scales and other technical exercises and any theory you were assigned
10 minutes: practice your specific homework from your teacher
5 minutes: play whatever you want! Goof off and experiment! Have fun!
Sometimes practicing like this can make a 30 minute practice go by faster and help students to achieve goals for better results and better lessons!