His patience, or his sanity. Something like that, at least.

"Probably, but it sounds like first I should figure out things like a place to stay and a job and all that. Since I won't exactly be getting supplies from Chaldea."

Though who's she kidding, she'd absolutely love to talk at length with another Master. She's really only managing to hold herself back for now because it's clear the topic may be a little touchy, and she can understand that. But someday...!