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30 ft in standard units = 9144 mm
In humans, nails grow at an average rate of 3 mm (0.12 in) a month.
Thus to grow 9144 mm it will take 9144/3 = 3048 months = 3048/12 = 254 years
However, in a human life your nails could not grow more than about 70 years * 12 = 840 months * 3 = 2520 mm.
So the answer to this question is your finger nails could never grow to a length of 30 ft.
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