Can your plant roots dry out over night
 

Hello fellow hydroponics friends. I have two questions if this board would be so kind as to answer them.

Q: Another one of those “how long should I run my pump questions”! I understand that with out light you can’t have photosynthesis. Thus, making it useless to run your pump during no light; right? However, this is where my question fits in. Can your plan roots dry out over night if you don’t run the pump at least one time? I ask this because I do run my pump at night three times (ever 2.5 hours or so) and I have not had the balls to experiment with this nagging question.

I water 24 hours because of frequent power outages so I won't have to keep resetting my timers.