stoping the repsonse timer

stoping the repsonse timer

What action is required to stop the response timer?
 
I have created a ticket that has a response time of 1 hour. 
for a test I open that ticket and do the following actions...
1. Actions > Pickup
and/or
2. Add a work log
 
But i STILL receive and email stating :
 
This is a warning notification for a first response time getting overdue at......

what is the action that prevents this?  please tell me that the help desk staff don't have to go into Action > stop timer every time.....

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