I wish to know if the task due date for the pre-built Approval Workflow, can have email reminders once the date is approaching. (Without using Sharepoint Designer) Lets say the DueDate for this approval is tml, can I ask sharepoint to send a reminder email to the task person to remind him to approve this task?
This doesn't exist OOB but you can use Information Policy settings to start a workflow based on a reminder date.
Laura has already done this for you: Workflow- Reminder Before Due Date – MOSS vs. WSS.
Post is in SP2007 but should be applicable for SP2013.