Try this
source="servername" Assignee="*" GroupName="TierII" OR GroupName="TierIII"
| stats min(DateTimeAssign) AS begin max(DateTimeAcknow) AS end by CallID,GroupName,Assignee,Priority
| eval duration=round(end-begin)
| eval Created=strftime(begin," %b %d, %Y %T %p")
| eval Closed=strftime(end," %b %d, %Y %T %p")
| stats avg(duration) as avgDuration values(CallID) values(Created) as Assigned values(Closed) as Ack by GroupName
| fieldformat avgDuration = tostring(avgDuration,"duration")
... View more