Everything should be nice n moist now.You want to wait until top of rockwool is on the dry side.Your roots are small,not needing much.Maby in 2 dayz? depending on temp/moister.I sugest keepin a "slight" breeze inorder to strengthen ur stem.Increase wind velocity as stem thickins.Air movement is a powdery mold inhibiter.No airmovement=powdery mold,no good.Wait and make the solution until your first dip.
Sotty can't give an exact time to water.Get a "feel" for the weight oc the container.What I did to "train" myself to water("dip")in this mannor is took duplicated a pot (w/ the hydroton & cubes,only dry)DRY-and just went by the weight diffrence.Gotta get the "feel" for urself.ITS NOT HARD.You've done everything right on the button,I know u'll get the watering down.