Change deadline monitoring time- workflow

Hi All,

I have an issue in which we are changing an existing workflow. For the testing purpose, we need to change the deadline pattern to 5/10 min. ( we will again change the functionality to the existing one after testing is complete )

The current program uses a custom FM to compute deadlines using only date values (not in min/hrs). 

Is there any FM which we can use in this case to change the deadline time to 5-10 minutes.

Thanks

Meenakshi