Timeline display problem

Hi all. I'm in the early stages of learning After Effects and I have a problem that I haven't been able to solve but I know that the more experienced After Effects users would probably have the solution. I have a composition that the timeline is displayed in seconds. The composition has 6 layers that I want to stagger in sequences(when one ends the next will start) and are 10 second long. Since the timeline is in seconds and once I've staggered the 3rd layer I can't see where I would start the 4th layer because the timeline is only displaying 24 seconds. Is there a way to display the timeline in minutes instead of seconds so I can stagger(place) the proceeding layers? I hope I explained my problem well enough to get an solution. Thanks.