The most important thing about practicing is that it should be a little and often. If your teacher (or parents) insist that you do half an hour or more per day as a beginner, this is counter-productive. As a beginner, no matter how intelligent you are, after a certain amount of minutes your brain will not absorb as much as it did in the first few minutes. Better to take a break and come back to it a little later. Just as learning a foreign language, it would not be appropriate to master too many words in a day, then trying to do too much at one time in your piano practice doesn’t really work. Ideally, you should practice once in the morning and once at night for at least 5 days per week (although 7 days per week would be better). It’s like working out – you may not see the results right away, but over time, you will see great progress. For a beginning student, 5-15 minutes morning and night should be sufficient. As you progress, this will increase of course and you will get to the point where it may be necessary to practice 2 hours per day or more depending upon what you’re working on. Learning to play the piano does require patience and discipline and if you have both of these traits, you will succeed.