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Light travels at a speed of 186,000 miles per second or 669,600,000 miles per hour. Light travels somewhat slower when it is "in" something, such as glass or water.
Light travels 186,282.397 miles per second. That is 983,571,056 feet per second.
Light travels 186,282.4 miles per second in the vacuum of space. At that speed, it takes the light from the sun about 8 minutes and 18 seconds to reach Earth.
Since a microsecond is a millionth of a second, just divide the distance light travels in one second, by a million.
The speed of light is 186,282 miles per second.