I have been in Al-Anon for two plus years, and only lived with a loved one with active addiction for four months.
Going has helped me to understand that I did not live active alcohol addiction when I was a kid, but both my parents did. They are both adult children of alcoholics and both sides of my family are rife with addiction.
Also for me it has helped with addiction outside of alcohol in the family too.
Al-Anon recommends six meetings before making a decision. They all have a different flavor so it is important to find one that fits for you.