I think you mean how long can you have the lights off?? If thats what u mean then 18 hours on and 6 off seems to be the norm, i run mine 24 on but each to his own.
If you had a power supply failure (for more than 6 hours) then it shouldnt matter too much, as it takes a few weeks to induce flowering. Hope this helps
well im moving, and its gonna be a few hours before i can plug the lights back up, so i was wondering would it be ok if it didnt have lights for half a day
well im moving, and its gonna be a few hours before i can plug the lights back up, so i was wondering would it be ok if it didnt have lights for half a day