She turned the dial only once; caution would behoove her until she knew exactly what she was dealing with. A force far greater than she could resist forced her eyes to shut, so she could only rely on touch and sound. There was only a faint buzz, and an increase in temperature so slight she may only have imagined it. When she was allowed to see once more, she looked around and noticed with no surprise that nothing in her environment had changed. Even Moaning Myrtle was still absent, or at least silent. A flick of her wand and a muttered, "Tempus," revealed that she'd gone back just a little more than an hour. The imprecision of it made her frown, but she supposed it did make sense. How effective of a measurement was a "turn", anyway? She would have to fiddle with it a little more to pin down exactly how far back a single degree would get her. Frustration and disappointment made her sigh, but if there was anything Hermione knew it was that one must work before they got to play.