TʜᴇʀᴀᴘʏGⒶʀʏ⁽ᵗʰᵉʸ‘ᵗʰᵉᵐ⁾

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

Similarly, watching videos/listening to music on full volume in public without headphones

Sounds like others covered all the bases already but, if you have further specific questions, I’m bipolar and a therapist, and happy to discuss