What anecdotal consequence is associated with a very short soak of just an hour or two?
Answer
Insufficient extraction of desired compounds for effectiveness
The duration of soaking is directly tied to the efficacy of the resulting tonic according to anecdotal reports concerning short exposure times. If the onion pieces are only submerged for a very brief period, such as just an hour or two, the extraction process does not proceed long enough to draw a significant quantity of the beneficial constituents—namely the sulfur compounds and antioxidants—out of the vegetable tissue and into the water. Consequently, such a short soak might render the resulting liquid ineffective for the intended purpose of the remedy because the concentration of active ingredients is too low.

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