"Mara will eat at eighteen hundred hours."
Translation:SopDI' mara, wa'maH chorghlogh Qoylu'pu'.
All the Qoylu'pu' stuff is idiomatic, so it's hard to tell how much you can fiddle with it and still be saying it right. Grammatically, there's no reason you couldn't do what you say, but Okrand didn't give us any phrases like that. So we really don't know the answer to your question.