There are seven days in a normal week, twenty-four hours a day, and one hundred and sixty-eight hours.

And Jiang Yu has 30 classes a week, each class is three hours, a total of 150 hours.

In other words, if the length of the 'time shift' is not counted, it means that witches spend most of their 168 hours a week studying—it is not the first time that Zheng Qing has calculated this number, but Every time he recalculates, he has a feeling as if it was the first time

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