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How long is 3 microns?

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It's about one-and-a-half times as long as an E. coli Bacterium.
In other words, the length of an E. coli Bacterium is 0.67 times 3 microns.
(Escherichia coli) (rod-shaped configuration)
An rod-shaped E. coli bacterium measures about two micrometers in length. A staple of biology labs, E. coli can reproduce in as little as twenty minutes.
It's about one-and-three-fifths times as long as a Mitochondrion.
In other words, the length of a Mitochondrion is 0.625 times 3 microns.
(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.
It's about half as long as a Nucleus (Cellular).
In other words, the length of a Nucleus (Cellular) is 2 times 3 microns.
(for animal cell)
The nucleus of an animal cell measures an average of six micrometers. The nucleus is the largest organelle in these cells, accounting for about 10% of the cell's total volume.
It's about two-fifths as long as a Red Blood Cell.
In other words, the length of a Red Blood Cell is 2.5 times 3 microns.
(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 one-thirty-fifth as long as a Strand of Hair.
In other words, the length of a Strand of Hair is 33 times 3 microns.
(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 one-thirty-fifth as tall as a sheet of Paper.
In other words, the height of a sheet of Paper is 30 times 3 microns.
(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 100 microns thick. This style of paper weighs a mere 5 g per sheet.
It's about one-thirty-fifth as tall as a Human hair, Strand of.
In other words, the height of a Human hair, Strand of is 33 times 3 microns.
(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.