1. For beginners with no prior musical experience: It can take approximately 5-7 years of consistent practice and lessons to reach Grade 9 level, assuming the student practices for at least 30 minutes daily and receives weekly or bi-weekly lessons from a qualified piano teacher.
2. For students who have some prior musical experience or have taken piano lessons in the past: The time required may be shorter, potentially 3-5 years, depending on the student's existing skills and the amount of time they can dedicate to practice.
3. For exceptionally gifted students with natural musical talent and a rigorous practice routine: It may be possible to reach Grade 9 level in a shorter time frame, such as 2-4 years, but this would require exceptional dedication, daily practice, and guidance from an experienced piano teacher.
It is important to keep in mind that these are just estimates and the actual time frame can vary significantly from person to person. Consistent practice, focused learning, and patience are key factors in achieving success in piano playing, regardless of the time it takes to reach a specific grade level.