Is it better to practice more often or more frequently?

What really matters is the overall quantity. Practice equals experience. The more time you spend practicing, the more experience you have. In other words, choose the practice schedule that will give you the most amount of time actually practicing. When you are away from the piano, practice the fingering on your leg, listen to recordings of the music and other similar music while you drive or exercise. The more time spent thinking about, listening to, and playing the instrument, the more progress you will make on the instrument.

Does that mean singing in the shower counts as vocal practice? Yes! The shower is one of the most effective places to practice because you can hear yourself better and the warm humidity relaxes the vocal cords. Practice should not be painful or boring; it should be fun! Making music is a time of artistic expression and creation.

The level of difficulty matters too. If the material you are practicing is too easy, you will likely not improve or make progress. If the material is too hard, you may get frustrated or feel discouraged. Discuss these feelings with your teacher and choose your music together. Find music that is fun, familiar, or interesting to you, AND at the correct level of difficulty. If you do so, practice will be enjoyable and effective.