[ There's a short pause here, as he thinks. It's not something in his active memory. ]

I would say about a hundred years or so. It did not develop at the snap of a finger. Instead, it is a process over time.

[ It can't be helped that he's so serious - when she laughs, he doesn't quite move, merely observing how she's laughing. He doesn't seem to be angry, though. ]

Do you find me amusing?