This article outlines where and how you can set the notification schedule on your site.
Step One: Navigate to Settings
Within the admin section, navigate to 'Settings' from the global navigation
Step Two: Notification settings
Scroll to the bottom of the page and you should now see 'Notification settings'. From the options, set the schedule for how you want emails to be sent by default
Step Three: Submit and save changes
Once you're happy with the changes click 'Submit' this will save the changes made