"The next twelve hours"

Translation: Le prossime dodici ore

[dnovinc]

" Le dodici ore prossime" should this also be accepted?

[HavardF]

I'm not a native speaker, but for me that sounds very weird. I think prossimo always goes before the noun.

There are though some people that say "la settimana prossima" instead of "la prossima settimana", but that is just a spoken thing.

[vivi8d]

Is "seguente" not a synonym for "prossimo"?

[Muttley_]

Not necessarily.
Seguente means "that comes after" whereas "prossimo" refers to something in the future. Ex. "Martedì scorso sono andato a Roma. Il giorno seguente sono tornato". "Martedì prossimo vado a Roma. Il giorno seguente tornerò"