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purpleoctopuppy t1_j3a1c6u wrote

Reply to comment by OneTreePhil in How much do water molecules move around within a stationary body of water? by KpgIsKpg

Diffusivity of water is on the order of 10⁻⁹ m² s⁻¹. Bath tub is on the order of a metre long, so it should take t ≈ L²/2D ≈ 10⁹ s. Since a year is e7.5 s, this means it would take on the order of 30 years.

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