Some parts of my hair grow faster than other parts and some parts grow very slowly. Using your concept, all I would be able to discover is what is terminal length for that one spot on my scalp. I would not know what would be terminal length for the rest of my scalp. But, it's an interesting idea. I'm kind of doing that anyway, only the part I'm growing to terminal length is a very large area of my scalp. I keep my bangs/fringe and face-framing layers short, so I don't look so severe. Also, I trim my nape hairs very short, so they don't look like a wooly mammoth peeking out from under my collar. Everything else is growing freely.
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