My customers would like to see the current state of the SLA of their problem on notification emails they get. This would mean that when the create a ticket the notification would show full SLA (say 4:00) and subsequent email notifications (on status change) would show the current SLA. For example, say that it takes desk 30 mins to respond for the first time so on the email notification for the status change from Open to Investigating they will see SLA as 3:30. etc.