light travels at about 300 million meters per second. multiply this by the number of feet per meter (a bit more than 3). now, divide 4 by this answer.
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Light travels at a speed of approximately 186,282 miles per second (or 983,571,056 feet per second). In 4 feet, light would take about 4.07 microseconds (millionths of a second) to travel from one end to the other.
Just divide the speed of light by the distance.
Well, it takes 2,700 years for light to travel that far. Anything travelling at half light-speed would take 5,400 years. At 1/4 light-speed, it would take 10,800 years.
It takes 51.43 seconds to travel 2,640 feet at 35 mph.
Like any distance, it depends on how fast you are going. At the speed of light it would take 4,000 years to travel that distance.
It will take light about 0.000834 seconds or 834 millionths of a second to travel 250 kilometers in vacuum, somewhat longer in any material substance.