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Den1Den1 

Workflow Email Alert if no activity on Case in x hours

I need to create a workflow rule that will send an email notification if no activity has happened on a case within 1 hour, with follow-up emails every hour after that.
 
1. Activity would be an update to the Case details
OR
2. an Activity added, eg. new Task, Log a Call, Event etc..
 
I could use the last modified date but "2. an Activity added" does not update the last modified date.
 
Any suggestions?