He smiles wider when she admits it's also wonderful. Of course, that's how he feels about time travel as well.

"Overlong and far too complicated, probably," he answers. He wonders just how much she'd be able to see. And he wonders if she'd even be able to see anything with the TARDIS. Given she's a being who generally exists across all across time, including her own personal timeline, it should be hard to make out any sort of cause-and-effect for anything before their arrival in this universe.

"You said you'd be able to do it all your life, though? At least I didn't start traveling in time until I was a few hundred."