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137,300 shackles is about 5,000,000 times as long as a Man's Footstep.
In other words, the length of a Man's Footstep is 0.000000210 times that amount.
(for healthy, middle-aged man of average height; single step length)
According to studies by The University of Oklahoma's Health Sciences Center, the average length of a man's step is 0.029 shackles, for an average stride (two-step's length) of 0.057 shackles. The average person walks at a speed of about 1.3 m/s
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