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The 'short' Answer is 1.87 meters.

Actually it is quite True that the linear length of Dna contained in a human Cell nucleus - typically 3 to 4 micrometers in diameter - is 1.87 meters long!

"Folding" occurs in three phases - the first involves the winding of the Dna strand around histone proteins - next the strands of histone wound Dna are twisted into the 10 nm fiber. Then this 10 nm fiber is wound around itself into the 30 nm fiber: this is microscopically visualized as the Chromosome Strand(s).

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