Workflow - add "hours" to options for Enrollment Triggers

I'm trying to automate follow-up emails to Targets who sign up for a call or meeting, and using "Last Meeting Booked" as the trigger for a workflow. (see screen capture). 

 

Please add "hours" and "minutes" to the pull-down options. Currently only "days" and "weeks" are available.

 

Capture.JPG

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