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* 3.33564095 microseconds - the time taken by light to travel one kilometre in a vacuum.
* 5.4 microseconds - the time taken by light to travel one mile in a vacuum (or radio waves point-to-point in a near vacuum).
* 8 microseconds - the time taken by light to travel one mile in typical single-mode fiber optic cable.
* 10 microseconds (us) - cycle time

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