Test Summary Notifications
Here's a method of sending the summary notification without waiting, use this for testing purposes knowing it will send to all of your clients (with outstanding records).
Snippet of code to temporarily place in your functions.php file:
Log into your admin and add "?send_summary_now=1" to the url. For example, http://site.com/wp-admin/?send_summary_now=1
After you load the url (and if the snippet is in your theme's functions.php file) a message will show that the notifications were sent and not to refresh the page.