The current reminder notifications are almost impossible to set up correctly.
Current Reminder Notification Settings Panel.
We propose Workfront use the existing "Send Report - Repeating Deliveries" functionality and add this to the timesheet notification reminder settings panel.
Proposed Reminder Notification Settings Panel.
This would allow the user to set repeatable notifications that trigger at a set time based on the criteria (respecting the System Locale). For example, a task passed its completion date will trigger a custom reminder notification daily at 12:00 GMT. A timesheet user has not submitted their timesheet will receive a weekly reminder on Monday morning, 10:00 AM GMT until they have completed their timesheets.