This indicates the number of days after expiry that the cleanup occurs.
A value of 0 specifies no expired guest accounts cleanup interval. The default value is 365 days.
This is seperate from the endpoint cleanup, please note the difference between known and unknown endpoints:
Unknown entries are deleted based on the last Updated At value for each Endpoint.
Known entries are deleted based on the last Added At value for each Endpoint. For example, if this value is 7, then known Endpoints that do not have the Added At value within the last 7 days are deleted.