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How long is 520.97 feet?

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It's about one-forty-thousandth as long as The Great Wall of China (wall only).
In other words, 520.97 feet is 0.00002537 times the length of The Great Wall of China (wall only), and the length of The Great Wall of China (wall only) is 39,420 times that amount.
(长城, 長城, Chángchéng, a.k.a. 万里长城, 萬里長城, Wànlǐ Chángchéng) (a.k.a. "The long wall of 10,000 Li") (from Shanhaiguan through Lop Nur, China) (wall segments only)
The Great Wall of China has total wall segment length of 20,530 feet. Built and maintained in multiple sections over about eleven centuries, the Great Wall is currently suffering the effects of erosion, especially in the older sections made primarily out of mud.
It's about one-forty-thousandth as long as The Amazon River.
In other words, 520.97 feet is 0.00002467 times the length of The Amazon River, and the length of The Amazon River is 40,540 times that amount.
(from Nevado Mismi, Arequipa, Peru through near Marajó, Brazil) (approximate distance)
The Amazon River has an approximate distance of 21,120,000 feet. Although by most measures it is the largest and one of the most significant rivers in the world, the region surrounding the Amazon is mostly sparsely populated and the river itself has no bridges across it at any point.
It's about one-fifty-five-thousandth as long as The Great Wall of China (total).
In other words, the length of The Great Wall of China (total) is 55,900 times 520.97 feet.
(长城, 長城, Chángchéng, a.k.a. 万里长城, 萬里長城, Wànlǐ Chángchéng) (a.k.a. "The long wall of 10,000 Li") (from Shanhaiguan through Lop Nur, China) (total length, all branches)
The Great Wall of China, including all branches and trenches, is 29,000,000 feet. Built and maintained in multiple sections over about eleven centuries, the Great Wall is currently suffering the effects of erosion, especially in the older sections made primarily out of mud.
It's about 95,000 times as long as a Strand of Spaghetti (thickness).
In other words, the length of a Strand of Spaghetti (thickness) is 0.000011 times 520.97 feet.
(average; restaurant and supermarket applications) (based on FMA Omcan Italian Made TR50 Counter Top Pasta Machine Extruder 13317)
An average strand of restaurant-grade spaghetti measures 0.0056 feet in thickness. In 2010, a California Buca di Beppo set a world record by preparing a 13,780-lb bowl of spaghetti, served in a swimming pool.
It's about 150,000 times as long as a Grain of Sand.
In other words, 520.97 feet is 127,000 times the length of a Grain of Sand, and the length of a Grain of Sand is 0.00000787 times that amount.
(medium grain)
Composed mainly of quartz, mica, feldspar, or magnetite, a grain of sand measures an average of 0.0041 feet. In 2007, a team of seven in Myrtle Beach created the world's tallest sandcastle, which measured 49.5 feet in height.
It's about 1,500,000 times as long as a Strand of Hair.
In other words, the length of a Strand of Hair is 0.00000063 times 520.97 feet.
(average)
A strand of human hair averages 99 µm (micrometers), with blond hair being the finest and black hair the thickest. On a healthy scalp, each strand of hair will last up to 6 years.
It's about 1,500,000 times as tall as a Human hair, Strand of.
In other words, the height of a Human hair, Strand of is 0.00000063 times 520.97 feet.
(average)
A strand of human hair averages 99 µm (micrometers), with blond hair being the finest and black hair the thickest. On a healthy scalp, each strand of hair will last up to 6 years.