Ticket Workflow enrolment triggers based on hourly time periods

I want to create notifications to our team (which get pulled into a slack channel) when support tickets go unresponded to for an hour, two hours, etc. However, there is no way to trigger a workflow based on, for eg, "Last customer reply date", or "Last contacted date" on an hourly bases. Itwill only calculate by days. 

Screen Shot 2019-11-13 at 2.01.43 pm.png

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