Translations:Survey quotas/41/en
From LimeSurvey Manual
Note that a quota system does not necessarily have to be added before you activate your survey. If you decide to activate the quota system at a later date, it will start to check the survey responses table and look for those entries that are marked as complete. Then, it checks to determine if the quota condition has been met or not. If it has been met, the next survey responses/entries received will be marked as incomplete.