How to use the tasks settings:
Click the at the right side of the menu bar. Select from the menu.
Click on
in the sidebar .Change the settings.
Interval of the reminder in minutes. Specifies the preset time interval for the reminder of the task's due date.
E-Mail notification for Accept/Declined. Specifies whether you will receive an E-Mail notification if the following is true: A task in which you participate has been re-created, changed or deleted.