It hadn't been. A few weeks at the most, potentially as little as a few days before taking up her position. But it had happened before classes had begun. She was certain of that.
"I didn't offer a detention," Tonks said. "I offered you the choice of telling me or me doing a wee dance in a few minutes while blocking your exit. You don't lose track of hours of time, so you might as well spill it. We're in the middle of a war, Draco. You can't lurk around the castle after hours and expect to be let off the hook without a reasonable explanation."