When I create an issue and then sub task associated with that issue there is no way for me to view the 'total' time fields for that particular issue.

For example, if I create an issue with two sub-tasks both estimated to take 2 hrs each then when I view the issue there is no way for me to see that the issue is estimated to take 4hrs total (other total fields that would be good are 'remaining time' and 'time spent'.