How long does it take to master all 8 grades of violin?

Question

when do we need to learn the theory for violin

Answer 1

I can not seriously answer this question, because it depends on the talent of the student, the amount of time in study.

The big error here is that ALL 8 grades.  No one ever totally masters any instrument. there is always room for improvement.

Who ever divided the violin in to 8 grades did not intend that this is as far as you can go, or that someone on grade 6 is a better musician than someone on grade 5.

Learn theory as you go along. If you learn what you need it will stick.  

Answer 2

it all depends on how much you practice and how good you are. the more you practice the less time it will take.  

Answer 3

When you're talking about "8 grades" I think you're speaking of the Canadian system and I don't know about that.  

I do know about theory, however.  There are some really good beginning theory books for violin students.  Theory should be learned from the beginning.  See:

Violin, Viola & Piano Theory

http://beststudentviolins.com/sheetmusic...

specifically, the Dorothy Croft books, if you're a beginning student.

If you're an adult student and you have a teacher to help you (which you should do), get the Essentials of Music Theory: Complete Self-Study Course.  This is really good stuff.