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The average density of human feces is approximately 1.06 grams per milliliter
https://en.wikipedia.org/wiki/Human_feces
Normal stool (Type 4) typically has a diameter of about 1 to 2 cm http://d2xk4h2me8pjt2.cloudfront.net/webjc/attachments/73/57bbee4-bristol-stool-chart.pdf
Radius = 0.75 cm
Density = 1.06 g/cm³
Mass = 3,500,000 g
Volume = 3,500,000 / 1.06 = ~3,301,887 cm³
Cross-sectional area = π × 0.75² = ~1.767 cm²
Length = 3,301,887 / 1.767 = ~1,868,000 cm = 18,680 m = 18.7 km
So 18.7km or 11.6 miles
Type 4 Bristol scale or are we talking some other stool types
It’s log scale.