I apologize if i am duplicating themes, but i've searched for 2 days and haven't found anything on the topic.
Basically I am looking at the following - When a customer opens a ticket and marks it as a "Solution" i have generic agent that has event based trigger and makes the state as "Pending Customer Response" (which is state Open).
Then I want if that state is there for 48hrs a notification reminder to be triggered to the customer. We often have have customers who forget about the ticket and then in few days they come and complain that we are not reminding them.

many thanks in advance
