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How fast is 17,000,000 furlongs per fortnight?

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It's about 40,000 times as fast as a Sloth
In other words, 17,000,000 furlongs per fortnight is 42,000 times the speed of a Sloth, and the speed of a Sloth is 0.0000240 times that amount.
(for Brown-throated three-toed sloth, Bradypus variegatus)
The three-toed sloth moves along the ground at an average speed of 400 furlongs per fortnight. Long thought to be lengthy sleepers, a 2008 study concluded that sloths sleep an average of only 9.6 hours per day.
It's about one-one-hundred-thousandth as fast as The Speed of Light
In other words, 17,000,000 furlongs per fortnight is 0.00000943073059152810 times the speed of The Speed of Light, and the speed of The Speed of Light is 106,036.323516480 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 1,802,617,499,780.10 furlongs per fortnight, per the formal definition of the meter. While visible light travels close to this speed in air, it slows to 1,201,744,999,873.40 furlongs per fortnight when passing through the glass of a typical window.
It's about 70,000,000,000 times as fast as Grass growing
In other words, 17,000,000 furlongs per fortnight is 71,000,000,000 times the speed of Grass growing, and the speed of Grass growing is 0.0000000000140 times that amount.
(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 0.00025 furlongs per fortnight 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.