Alert Frequency in HCM

Summary:

I would just like to ask how do we go about alert creation in HCM. The requirement is to sent Visa Expiration reminders before 30days to worker and AOR update worker's Visa Expiration. we have created the expression and it is triggering the notification we have manually tested those. we are not sure how to proceed with scheduler. what level of frequency should we need to keep ?

Please advice.

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