How long is 1,250,000,000 miles?
It's about 250,000,000,000,000,000 times as long as a Red Blood Cell
The length of a Red Blood Cell is about 0.00000000470 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 sheet of Paper
The height of a sheet of Paper is about 0.0000000600 miles.
(for US Letter, a.k.a. ANSI A; 215.9mm by 279.4mm (8.5 in x 11 in); 20lb)
A single sheet of 20 lb, 8.5 inch x 11 inch paper is just 0.0000000600 miles thick. This style of paper weighs a mere 5 g per sheet.