I have a quiz on which I've set a time limit of 90 minutes. However, when I go into "moderate this quiz" it's showing that several students took more than this amount of time. Next to one student, it says "finished in about 2 hours." Next to the other student is says "finished in about 4 hours." How is it possible that the student took 4 hours when the time limit is set to 1.5 hours?