In regards of your watering confusion, that would simply kill your roots, you must water like normal, just dont feed it nutes.
also, just give a good flush ( between 2 - 3 times the normal amount of water you give your plants ) if you normally give your plant 1 gal to drain off, obviously 2-3 gallons of ph water to flush off, then just let it dry and feed it normal water till harvest..
*note* many growers have done side by sides and have stated that there is no difference in taste, smell, or appearance, and their or many who say otherwise. once again, just something you have to try fo yourself
consider 2 factors
-soil
-soiless mix / hydroponic
soil with the longest i have heard 7-14 days
soiless and hydroponic i guess would be pretty similar at 1-5 days
it really depends on the grower..
With that being said, i completely agree with tip top that there are countless growers that do not flush, (especially organic growers), so like he said as long as you have 2 plants or more experiement with it.
I have learned that no matter how much research that you do and how much you stay on these fourms, the quickest and best way to get your answers is to experiement with your plants, at the beginning you want to baby them, and scared to mess them up, as you get more of them, you want to see how much they can handle and your willing to take those chances.. Its just the way the human mind works once we get comfortable with something we want to explore its maximum pontential.
Good Luck