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Long hair
Since hair will start to become dead, your hair will stop growing at around two feet long.
The Declaration • March 11, 2020 • https://thedeclarationatcoloniahigh.com/46986/fun-factofthe-day/if-you-never-cut-your-hair-it-would-likely-stop-growing-at-about-two-feet-long/
If you never cut your hair, it would likely stop growing at about two feet long