The Doctor made a noise, face all squished up, that was judging distance and time length, but not coming up entirely on either side of the line with that question. Before he just gave up a bright grin, hand raising. "Dozen of one, two dozen of the other. It's a while, but I've been places longer before. Whatever it is, it can't last forever."

Almost nothing lasted forever. Except him, and time. It was easy to take it and toss it back. "Yourself?"