What is SLA response time

What is SLA response time


Hi,
I configured a SLA with 15min Response Time and 60min Resolution Time, associated with a specific priority.
When a new ticket arrives with that priority til when is the response time suposed to be counted? 
I tryed to assign the ticket to a technician, passe it to the start work status, send a reply to the requester.
But the response time appears to be still running....


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