I think it is better to let them sleep, plants can only use so much light the rest is wasted.
Light bleaching is also a chance.
I keep mine on 18/6
I do seedlings from 0 to 2 weeks, maybe 3, under a 4' t-12 for 24/0. Then they go to a much more intense floro rack, for 18/6 till mature, then they flower under a 400w HPS, obv 12/12.
i dont its not natural the sun isnt around 24 hrs a day. but thats just my opinion