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I think retaining any length is good. There are a good number of women that have hovered around the same length their entire life...and since my HHJ I've only retained about 4" per year as well. I love those progress pics with amazing growth progress, but mine is much less remarkable than that.
Agreeing with what the other ladies here have said. In the first yr of my HHJ I retained/ grew about 6" of hair. The following year it was 4". With all of the growth, shedding, PJism, stress from life, and general what's best for my hair learning curve, 4 to 6 seems reasonable.