alot of people ask this
well..
ive grown in many environments. currently my lights stay on 24/0. if its a flowering room, it still stays on that but crops get rotated or light moves. i do this for ease, maintenance and to avoid possible failure..i dont have the time to make it to all my grows daily. i try to make it weekly.
with that said. the plant likes a dark period for other biological processes, and this allows you to use stronger light even if for less time without bleaching.
the intensity is what controls internode length allowing for denser buds..i mainly grow heavy sativa and this matters to me. it wont really speed anything. once the plant reaches its saturation point it cant utulize more light, atleast on the effected area(you dont want this, but to be close. i do bleach some of my strains in flower but thats more of an "advanced" technique and personally ive never heard of others doing this). ideally we are pushing our plants to its limit, lowering lights accordingly and pumping nutes. so your realistically not getting more light at 24/0
i prefer 20/4 personally
if yiu have extra lights, use them. this is when the olant needs them.
the sun is naturally less intense in flower especially towards the end. the plant has adapted to this, same with less nutes at the end.