One concept that is consistent across all the members of the studio, regardless of experience level is this concept: daily practicing yields significant improvement over time. The longer the period of time, the larger the increase in improvement. This is an observation from decades of my own musical journey as well as the instruction of others.
Different students of course have different goals. Perhaps the student is just getting started, or perhaps they are playing at a proficient level and are preparing for an audition for a high school or university level ensemble. Both of the situation require different levels of input. But the concept remains the same.
For the beginner student, perhaps five to ten minutes a day is advisable in order for the student to feel comfortable with the drumsticks in his or her hands to gain basic functionality in terms of approaching the instrument.
For the advanced student, preparing for a university school of music audition, perhaps a practice plan that occupies three or four hours a day is advisable. Again, each situation is unique and that is one of the benefits of studying percussion here at groove - custom tailored advice on practice habits.
Suggested reading on this point is here from the Association of Psychological Science: Deliberate Practice and Performance in Music, Games, Sports, Education, and Professions: A Meta-Analysis