For the curious mind, you can measure relative ionic strength with an ohmmeter/multimeter. For the purposes of this discussion, I tested 9g of kosher salt in 340g of water. The test:
500 mL beaker, polycarbonate
340 g @ 41 F water, carbon filtered
9 g salt, kosher
I affixed the two multimeter leads exactly 8.5 cm apart and immersed 0.5 cm in the solution. As a control, I began by measuring the electrical resistance of the filtered water alone. After dumping the salt into the solution, I measured the electrical resistance again. I then proceeded with a cycle of stirring the solution for ten seconds, taking a reading, and then repeating until the electrical resistance stopped dropping.
32.56 kOhms, control (no salt)
25.01 kOhms, before stirring
5.57 kOhms, after stirring 10 s
4.85 kOhms, after stirring 20 s
4.79 kOhms, after stirring 30 s
4.79 kOhms, after stirring 40 s
Unless someone barely stirred the salt they're trying to dissolve, far more than half of the ionic strength is available after just 10 seconds of stirring. I even used the coldest water anyone would potentially use in the case of making dough. The rate of dissolution would be even faster if the water were warmer.