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Ten seconds.
Light will travel 1 miles in about 5.368 microseconds (That means that light will travel about 65,000 miles in the time it takes the average person to blink!)
My vote is: 8minutes 19seconds
Light travels at a speed of approximately 186,282 miles per second in a vacuum. To calculate the time it takes for light to travel 100 miles, you can use the formula: time = distance/speed. Thus, it takes light about 0.000536 seconds, or 536 microseconds, to travel 100 miles.
It would take 10 seconds.