Create a quiz with a time limit (I used a 5 minute quiz on my site).
When the time runs out the quiz is supposed to automatically submit and it does not. (I waited 14minutes 25seconds)
If after a long time, you advance to the quiz summary page it will state that time has run out and end the quiz. This is as expected.
Because quizzes are no longer given automatic zeros if they go over a certain time then a student can get full credit regardless of how long the user takes.