Correction for the speed of a Skydiver (belly-to-earth)
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How fast is 68 times the speed of light?
It's about 400,000,000 times as fast as a Skydiver (belly-to-earth)
The speed of a Skydiver (belly-to-earth) is about 0.000000180 times the speed of light.
(Belly-to-Earth orientation, average conditions, terminal velocity)
A belly-to-Earth oriented skydiver's terminal velocity is about 0.000000180 times the speed of light. In a typical jump from 3,900 m (13,000 ft), a diver in this orientation will be in freefall for 60 seconds.