Hydroponic watering schedule

I've been watering my hydro babies 3 times a day during the light periods. Easy to do in equal parts. But when you move to flower... do you water during "light off" periods? I've been told and read not too but that seems a long time to go without water when they get used to that schedule. Anyone assist with that?

And my plants seem to do okay with 3, 30 minutes cycles. Is that about the standard?
 
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