Not really any point in waiting. As soon as they are out of the seedling stage hit them 4 or 5 times a day. Then go up to 16 times a day in mid veg. 10 times a day in flower because not as many light hours but increase the volume of each event.
First water 1 hour after lights come on. Water every hour. Last water 1 before lights out. Collect and monitor the run off of each plant individually if you can. Back off the volume if you have too much run off. Increase if not enough.This is the way to get the best results out of your Coco.
Running a seperate timer, pump and irrigation line to each plant is the optimum because you have more control to make sure each plant is being fed correctly.