Q.How Much Moisture
I would like to to start an aeroponic herb garden and was wondering if the misters stay on for 24hrs, or is there a timed schedule for the sprayers to be on and off? Is thereĀ a minute/hourĀ time cycle, or do they stay off while the plants are in their night cycle (lights on- sprayers on, lights off-sprayers off)?

I have never worked with an aeroponic system myself but I did find a site that may be helpful in all areas of aeroponic growing.
Good luck in your new venture!
https://www.gardeningknowhow.com/special/containers/growing-with-aeroponics-what-is-aeroponics.htm