For me I guess I would say just below the shoulders. It is too short right now, so I have difficulty with some of the true 3A parts that are nearly straight. At one time, 5 years ago, I had BSL hair and it all coiled beautifully. Unfortunately, my hair just doesn't seem to grow much.
Type 3a/3b, fine/medium hair, modified CG since 12/2003, Using CHS Curl Keeper, Bioterra gel, Ojon, Elucence