Thanks for your reply, I tried with flexi task but I can only set number of reminder but i need to set the reminder until the assignee approve or reject the request . Can we do this with Flexi Task ?

Where you able to find the details you wanted? You can set these settings in the reminder tab in the flexi task.

Did you ever figure out how to do this?  I also need to do something like this to my workflow.  I would appreciate any suggestions.  I have Request Approval task that if nothing is done within 5 days, a reminder needs to be sent.

Why is question an accepted solution?