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You can set a time limit for completing the quiz.
In the options in your quiz menu item, set timed quiz to yes and put the time (in minutes) that the user has to complete the quiz. You can also adjust the text next to the timer and the message shown when the time is up.
If the user does not complete the quiz in the allocated time, it is automatically submitted and the user is prompted with the message you set in your menu item options.