Any way to get action group entries to list time taken for sub items?

I'm trying to figure out where time is being spent, my project has several top level action groups and I would have expected the 'run time' for those to show the total time all sub-items have taken.  Instead pretty much all of the action groups show 00:00:00:00.

I can figure it out by looking at the end time of the group and the start time of the following group, but that's a bit of a hassle.  Perhaps I'm just not looking in the right place?