Lft normal, hbv dna 13 iu/ml and hbsag (eliza test) austrailian antigen comes 1.36 ( decreasing per yr) in how long can i be relieved of hepatitis b?

Depends: You are young and without knowing more information, hard to say. However, some can clear hepatitis b on their own, while most people have a lifelong chronic hepatitis b state that can be "active" or "inactive". That is why it is very important that you see a hepatitis b liver specialist to determine your course and if you need to be treated with antivirals or have lab tests occasionally!