Go to Site Administration -> Plugins -> Quiz -> General settings Confirm that the following description is displayed below the "Pre-create period" setting: The period ahead of the quiz open time that attempts will be pre-created. Attempts are generated by a scheduled task (mod_quiz\task\precreate_attempts) running each hour by default. Since quizzes cannot be edited once they have attempts, it is best to keep this period as short as possible. If you tend to have one quiz or set of quizzes starting at once time, a short period like 1 hour is sensible. If you have several starting at different times through the day, and wish all pre-creation to happen when the system is quiet such as overnight, you may which to set this to a longer period such as 12 hours and adjust the scheduled task to run during quieter hours. This setting is controlled at site-level, it cannot be overridden by individual quizzes.