A human cell has over 3 billion base pairs of DNA, or a total of 6 billion (6 x 10⁹) nucleotides.

The distance between nucleotides is 0.34 nm, or .34 x 10^-9 m.

(6 x 10⁹) x (.34 x 10^-9 m.) = 2.04 m. of DNA per cell.

You have about 10 trillion (10¹³) cells (chapter 15).

If all the DNA in your cells were uncoiled and lined up end-to-end, their total length is
(10¹³) x 2 m. = 20 trillion m. = 20 billion km.

The distance from Earth to the Sun is about 150 million km, or 300 million km round trip.

You have enough DNA to take 60 round trips to the Sun.