Answer
approximately $2/3*\pi$ (or 2.10 seconds)
Work Step by Step
$P=2*\pi\sqrt{I/32}$
43 inches = 3.583333 feet
$P=2*\pi\sqrt{3.58333/32}$
$P=2*\pi\sqrt{.111979166}$
$P=2*\pi*.334632$
$P=\pi*.669264$
$P = 2.102$
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