"In one week's time," he responded almost immediately. "The amount of progress you make by then will determine how often I return afterward, and how long our lessons are."
Bran would be listening, of course; but he left that part out. If it was a voice in her head, then of course it would know if she sang or not. With obvious things like that, he needed to be careful. Saying something he should have already known would be a tricky thing to avoid.