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Velocity doesn't tell you much either, since the net velocity of the glass of water is zero.

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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From a Physicist working in the sphere of Biology

A lot.

Unless that stationary body is some kind of molecule fixed or arranged/bounded to a surface sort that would either restrict or minimize kinetic displacements of individual molecules ( each such displacement requiring input for entropy penalty )

Another way of fixing molecules is freezing the water...

PS. If the body refers to a container for transportation and storage, temperature of the water is all you need to know about the average displacement count/interaction count.

It'd also mix via convection as deuterated (heavy) water is, well, heavier than regular water.

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I remember calculating this in a ChemE class. If a bath tub of water no currents at all in it, any given molecule at one end would take something like six million years to diffuse to the other end. Any bulk current at all reduces the time to tens of seconds.

Please someone check me? It was an in-class problem in 1984 thanks for the memories Dr. Knickle & Coach

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Speed doesn't tell you very much, since they aren't traveling in a straight line.

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