[He watches as Amelia checks her phone (silly Midgardian contraptions; far too complicated for their own good, accentuating the clutter this realm already suffered from--) and responds idly.]

We have been gone for a fair amount of time, though I'm surprised it has taken them this long to notice.

[He gets that look in his eyes, coupled with a grin.]

You should respond to them with something vague, confusing, and perhaps slightly worrying for their delay.