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How long is 1,250,000,000 miles?

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It's about 250,000,000,000,000,000 times as long as a Red Blood Cell.
In other words, the length of a Red Blood Cell is 0.00000000000000000370 times 1,250,000,000 miles.
(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 20,000,000,000,000,000 times as tall as a Human hair, Strand of.
In other words, 1,250,000,000 miles is 20,000,000,000,000,000.0000000000000000000 times the height of a Human hair, Strand of, and the height of a Human hair, Strand of is 0.0000000000000000500 times that amount.
(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.