When plants grow during the day, while lights are on they are multitasking, they are taking in the light rays and processing them for growth and to produce resin/THC and to store up energy for night so less of their overall energy goes to actual growth. At night, in the dark, they only do one thing and that is grow.
Plants grow much more efficiently in the dark hours but of course can only do that for so long because they are relying totally on stored up energy they took in during the day so it is not like you can increase the dark hours and get a bigger better plant. But they use their stored energy more efficiently in the night or dark hours and almost all of it goes towards growth and very little to anything else.
So a 24/0 time cycle actually works against you. For some reason some people say it works better but that goes against how plants work, how their mechanisms work, how they function, how they actually grow.