The Doctor continues the clapping, but frowns at the statement. That was quick. Too quick. Not entirely wrong, but not entirely right, either.

"That's not the same. I'm used to feeling and sensing time. It's another sense for me, like sight or touch."

And for now, this is the only acceptable way to keep track.

"A watch is not physically feeling the passing of time. This, is."

Because he has to feel it. If he can't feel it, well...