Using a Timer on a service Task

Hi
Is there any way we can use the boundary timer on a service Task ?

My Scenario is 

User submits a request and then I need to wait for 3 days before I trigger the next task to the approver.

I have tried using a timer on a service task but it does not work.

What are the other methods that we can use here to implement the same.

 

Regards

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