Years. [Claude repeats that slowly, as if it confirms his suspicions, but it still isn't something he can quite believe. He has no reason to hide his obvious surprise -- she has the advantage on information (and, yes, years) over him, so he just scrambles to process just what that means.] Oookay.

[He has so many questions, but he supposes he should start with the obvious point.]

Someone explained to me that Aions are brought here not just from different worlds, but different points in time, too. So I guess it can only be the case that you're from my future... The last I remember, Edelgard had only just declared war, and launched her attack on Garreg Mach.

[And while he'd fought hard alongside Byleth, Dimitri and the others, he knew a losing battle when he saw one, though the fact she says years also tells him it's a long and protracted war. Maybe she wasn't satisfied with conquering only the monastery...]