['No need to sound so shocked about it' is pretty much exactly what Ryunosuke is thinking as well. It's fortunate he's not on thought-to-text at the moment, or that would probably be the message that came through, instead of what he says next:]

Then it's probably safe to assume that 'longer than a hundred years' is the very real disparity between our respective time periods, because I promise you I've never heard of it.