Tracking time from Created to Opened / "Given to"

Attempting to come up with query logic that tells me

Time between Created and “Opened and Assigned to Someone”

Need to find the table vars for the entry in the ticket history that is

Fri Jul 30 05:36:04 2004 fred - Given to bob

For created I know its Tickets.Created or
TIME_FORMAT(SEC_TO_TIME(Tickets.Created))) … What is it for this entry
when the ticket is opened and Given to someone?

Is that the same as Tickets.Started ?