you can run 24-7 I have on young plants but he is right read up some on it,,,will try to explain some,,,,,your plant is like a factory taking in light ,,,Light = food,,,light is the food your plant eats to have photosynthesis occur ,,it is the reproduction of the plant cell,,,while lights are on your plant is taking in light,,water nutrients and CO2,,night time for a plant is important as well as ,,it is like all this stuff arrives at said factory all day,,night time is when they get to use that material essentially,,or how it works in nature,,,always remember,,you growing is always a attempt to replicate what happens in nature,,you are mother nature in your grow room you provide all things,,,,,,,you could stay up for days at a time if needed but it is stressful with out proper rest,,,,,,some folks go 24/7 some don't,,but read up on it ,,information will be your guide threw the grow so try to read up ahead of time before you encounter problems,,that has worked well for me I studied deficiency's and common problems I even did a bit of reading on soils and built my own,, ,,here are a few of my ladies 1 month 6 days into 12-12,,plants are Sour Diesel ,,70% sativa so growers lol