I had asked a question in another thread, and thought it might be helpful to create its own thread just in case it could be helpful to any other developers out there:
"I am trying to create a rule which follows up on existing orders of specific products. Each product has a different time interval for "follow up reminder", and my rule should trigger an email to be sent to a customer at a date which is calculated Order Creation Date + Follow Up Interval.
ie Order Creation + Value provided from Products in the order"