The room is cleared except for a chair, a rug, two candles and a very old clock that has been in the hall since before anybody was born.

CorvinaOne hour. If she finishes before the hour is up, the hour starts again. That is the whole of the rule and it is not a joke.

MioneAnd if I cannot do an hour.

MalfoidThen we do it again tomorrow. And the day after. The clause has no patience and this school has nothing else to do.