Just as Professor McGonagall had said, the dial would only turn four times in either direction. When she went full capacity the buzz would become louder and the heat would increase, causing nausea to form in her belly and head like carsickness. Unpleasant as it was, it lasted for only a few moments. What would more than four hours do to her body? The nausea would become worse, logically. Still, it was hard to predict symptoms when she could only access the very beginning of the process. Not that she really wanted to discover personally how broken the body becomes through excessive time travel, but curiosity was a beast she had no desire to tame and she didn't really feel that she had a choice.