Hello,
Creating a schedule period will accomplish this for you. Set the period for monthly and the system will automatically create a scheduled job for your surveys to run according to the schedule. The below is taken from the SNOW product documentation site for this:
"For example, if you set the schedule period to Monthly and someone attempts to send survey invitations twice in the same day, the system generates survey instances for the survey users the first time only. At the beginning of the next schedule period, the system generates another survey instance for each survey user who completed the previous one."
Link: https://docs.servicenow.com/en-US/bundle/sandiego-servicenow-platform/page/administer/survey-administration/concept/c_SchedulePeriods.html
Please mark this answer "helpful" or correct if applicable.
