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<blockquote>How do I deduce which setting suffices for mixing table salt + COLD tap water?</blockquote>

<b>Measure it.</b>  That really should have been obvious.

My gut feel is that any reasonable agitation will work about equally well.  The purpose of agitation is to prevent localized regions of highly saturated solution where new solid won't dissolve, even if overall there is enough solvent for the solute.  Any "blender" speed should be fast enough to keep the mixture reasonably homogeneous.  I therefore predict that the slowest speed will work as well as high speeds.

However, there is no point guessing since this can be measured experimentally quickly, easily, and with only a stopwatch in addition to the blender.  Like I said, measure it.