To recreate a reminder you can extend the process the following way:
![alt text][1]
The System task blocks the process for a specified duration:
![alt text][2]
The alternative gateway checks if the origin task is already done in the meantime:
![alt text][3]
If this is the case, the remind reminder process ends, otherwise a new reminder task will be created.
[1]: http://answers.axonivy.com/upfiles/2016-10-14_21h30_24.png
[2]: http://answers.axonivy.com/upfiles/2016-10-14_21h51_00.png
[3]: http://answers.axonivy.com/upfiles/2016-10-14_21h31_04.png