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How fast is 128 inches per minute?

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It's about 1,500,000 times as fast as Grass growing.
In other words, the speed of Grass growing is 0.000000710 times 128 inches per minute.
(for Kentucky Bluegrass, Poa pratensis) (a.k.a. Smooth Meadow grass, a.k.a. Common Meadow grass) (Summer months, ideal growing conditions)
Kentucky Bluegrass, one of the most common grasses in North America, grows about 0.0001 inches per minute in the summer months under ideal conditions. When left un-mowed, Kentucky Bluegrass grows to heights of 60 to 90 cm (2 to 3 ft) and blossoms with a blue flower.
It's about 0.0000006 times as fast as a bolt of Lightning.
In other words, 128 inches per minute is 0.000000550 times the speed of a bolt of Lightning, and the speed of a bolt of Lightning is 1,800,000 times that amount.
(atmospheric electrical discharge)
A bolt of lightning can travel at up to 230,000,000 inches per minute when arcing from the atmosphere to the Earth. An estimated 280 million lightning strikes strikes occur each year.
It's about 0.0000000002 times as fast as The Speed of Light.
In other words, 128 inches per minute is 0.0000000001807472640 times the speed of The Speed of Light, and the speed of The Speed of Light is 5,532,587,200 times that amount.
(C) (in a vacuum)
The speed of light (and all other electromagnetic radiation) in a perfect vacuum is known as "c" and measures exactly 708,171,161,000 inches per minute, per the formal definition of the meter. While visible light travels close to this speed in air, it slows to 472,114,107,000 inches per minute when passing through the glass of a typical window.