If you're doing coco and have precharged your coco before you put your plants in it, then watering to 20% runoff from the beginning makes a lot of sense. If you're doing soil you may have about 2-3 weeks where your hand watering and you won't be focused on getting run off. Pot weight is the best way to judge when you need to water let him soil dry out an inch and a half down is probably a good way to judge and coco once they're mature you can get away with quite a bit of feeding and watering.
If you water by hand then giving some water to all your plants and then circling around and giving them some more water and then circling around and giving them some more water till you get run off is the way to go.
If you are on auto water then you need to just make sure that everything gets soaked all the way out to the fabric sides and you get your run off.
I do have timers that allow me to set up to six different watering cycles and I could set a short cycle for each plant and then a longer cycle shortly thereafter if I wanted to get the same effect but boy that seems like a lot of trouble.
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