Question to ldapUserCleanupInterval


i have a question for User deletion with LDAP.

The option ldapUserCleanupInterval - is it running by default?
Or must i this configure in the config.php?

The user will be marked as deleted. I can show this with
sudo -u www-data php occ ldap:show-remnants

If i now run sudo -u www-data php occ user:delete without a username - what happends?
Will all user delete or only the user are in the table “ldap:show-remnants”?