I never go 24. The plants need to respire a little and good things happen at night (like increased root growth).
My schedule: 16/8 for two weeks. 18/6 throughout veg , 12/12 for most of fllower, 10/14 the last two weeks. (its a natural hormone kind of thing).
But to answer your question, no it shouldn't herm.
I think this is the schedule im going to use....people can argue all day im sure on the whole 24 hour light debate, but i think your right about the plants needing some dark period to respire and like you said good things like root growth and things like that happen at night...now i have always used 24 hour lights in veg, but now that i think on it more, its my understanding that in nature pot can grow in 24 hour light in some places, but unless you have that strain then i dont think its necessary...i think it all boils down to what strain you have, and if your not to sure than just go with what happens naturally in nature which is like legallyflying said...16/8 for two weeks, then 18/6 throughout veg, then 12/12 to flower and 10/14 at end of budding....thats pretty much what happens in nature and it gives your plants the night it needs to focus on root growth and im sure the plant probobly rejuvenates cells and stuff like that at night as well when its not totally focused on producing cloryphyl and growth........now im no expert grower or anything like that, but it seems like what naturally happens in nature is the best thing to stick too, cause like you said its a natural hormone thing!!
I love when my lights go off at night cause it always seems like as soon as they do my whole room gets a REAL sweet smell as soon as they go off, so thats a bonus too...lol
thanx for all the advice and input yall...im sure the debate on light scheduling could go on all day..........