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How fast is 7,800 furlongs per fortnight?

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It's about one-seventy-five-thousandth as fast as a bolt of Lightning
In other words, the speed of a bolt of Lightning is 77,000 times 7,800 furlongs per fortnight.
(atmospheric electrical discharge)
A bolt of lightning can travel at up to 580,000,000 furlongs per fortnight when arcing from the atmosphere to the Earth. An estimated 280 million lightning strikes strikes occur each year.
It's about 30,000,000 times as fast as Grass growing
In other words, 7,800 furlongs per fortnight is 32,000,000 times the speed of Grass growing, and the speed of Grass growing is 0.0000000310 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.
It's about 0.000000005 times as fast as The Speed of Light
In other words, 7,800 furlongs per fortnight is 0.00000000432704109493640 times the speed of The Speed of Light, and the speed of The Speed of Light is 231,104,807.664120 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.