Bran resisted the urge to start talking about the building and how insane it was, since it was too risky. He still didn't like that she thought herself crazy, but he could deal with that later. "Usually" was all he said before considering her next question.
When to start - that was a good question. He needed to prepare, although an imaginary voice wouldn't, would it? Then again, it wouldn't need to justify itself either. "The end of this week," he said after a moment's pause, sounding confident and final. She wasn't meant to argue.