Open the info panel, and you they have to be layer markers, not comp makers, but just alt-click each marker and the duration will pop up in the info panel.
Johnny Cuevas, Editor
ThinkCK
“I have not failed 700 times. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work.”
—THOMAS EDISON on inventing the light bulb.