How long for my Shih-Tzu's hair to grow?

How long will it take my my Shih-Tzu's hair to grow completely out? She is 8 months old now and I love grooming her and fixing her hair in different styles but I am a bit on the anxious side for it to be completely grown out.

If you are asking how long before the have a full show length coat, it could take 1 1/2 to 2 years.. have fun grooming