It’s been several lifetimes but only around a hundred years, though it feels so much longer. The Doctor wonders if it’s because of how many bodies he’s gone through, or because he’s come to think of any part of his past before the War as long ago.

“Oh he still does that,” the Doctor assures her breezily. “His ways have just grown subtler and more elegant. It’s quite impressive really. And it’s been about a hundred years for me,” he adds. “Nothing terribly upsetting.” –well, as long as certain truths never come to light–

And is the Master really offering to get her drunk? That is quite a few levels of disturbing.