Refresh interval of SLA in Incidents

Hi All,

In Incident Form, there is tab called Task SLA where in we can see the SLA details attached to the ticket. I created a ticket whose Response SLA was 4 hrs.   I did not met the Response SLA. I checked the ticket after 2 hours. I found that in that SLA Response time was showing   Business elapsed time or   Actual elapsed time as 1 hr 30 mins   however it should show 2 hours. I need to know is there any time interval at which these details get refreshed or do we need to do any modifications so that it should show the exact time elapsed.

Thanks,

Punit Chourey