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How long is 66 feet?

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It's about one-four-hundred-fifty-thousandth as long as The Great Wall of China (total).
In other words, 66 feet is 0.000002270 times the length of The Great Wall of China (total), and the length of The Great Wall of China (total) is 441,000 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) (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 one-six-hundred-fifty-thousandth as long as The Diameter of Earth.
In other words, 66 feet is 0.00000157701230 times the length of The Diameter of Earth, and the length of The Diameter of Earth is 634,110.460 times that amount.
(Equatorial)
The Earth — not a perfect sphere, but rather an oblate spheroid with bulged middle — has a diameter of approximately 41,851,289 feet at the Equator. The first complete view of Earth's diameter was in a photograph taken from a V-2 rocket launched in 1946 by the United States Army, which reached an altitude of 343,200 feet.
It's about 0.0000005 times as long as The Circumfrence of Earth.
In other words, 66 feet is 0.000000501978610 times the length of The Circumfrence of Earth, and the length of The Circumfrence of Earth is 1,992,116.80 times that amount.
(Equatorial)
The Earth — not a perfect sphere, but rather an oblate spheroid with bulged middle — has an Equatorial circumference of approximately 131,479,700 feet. The first airplane trip around the circumference of the Earth (with a few stops along the way), was completed in 1924 by the United States Army Air Service, and took 175 days.
It's about 2,500,000 times as long as a Red Blood Cell.
In other words, the length of a Red Blood Cell is 0.000000370 times 66 feet.
(a.k.a. RBCs, a.k.a. haematids, a.k.a. erythrocyte, a.k.a. erythroid cells, a.k.a. red blood corpuscles) An average Red Blood Cell measures 7.5 µm (micrometers) in diameter. An average human has 20 - 30 trillion red blood cells in their body and each cell completes a circulatory lap in about 20 seconds.
It's about 3,500,000 times as long as a Nucleus (Cellular).
In other words, the length of a Nucleus (Cellular) is 0.000000290 times 66 feet.
(for animal cell)
The nucleus of an animal cell measures an average of 0.0000200 feet. The nucleus is the largest organelle in these cells, accounting for about 10% of the cell's total volume.
It's about 10,000,000 times as long as an E. coli Bacterium.
In other words, the length of an E. coli Bacterium is 0.0000001000 times 66 feet.
(Escherichia coli) (rod-shaped configuration)
An rod-shaped E. coli bacterium measures about 0.00000660 feet in length. A staple of biology labs, E. coli can reproduce in as little as twenty minutes.
It's about 10,000,000 times as long as a Mitochondrion.
In other words, 66 feet is 10,700,000 times the length of a Mitochondrion, and the length of a Mitochondrion is 0.00000009350 times that amount.
(Eukaryotic; average)
A mitochondrion measures between 0.75 and 3 micrometers (µm). The mitochondrion is commonly referred to as the powerhouse of the cell, responsible for the generation of ATP. The size, shape, and distribution of mitochondria varies widely, with human liver cells each having 1,000 to 2,000 mitochondria.