I'd done a couple of non-stop runs over 30 mins a few weeks ago (both 5K) but then I hurt my knee and when I tried again I had to stop at about 20 mins (getting sore). Today, on my 55th birthday and in my new mad shoes (Vibram FiveFingers), I ran another over 30 mins non-stop. I think this now counts as graduation!
ps I'm not insane re starting the FiveFingers with a 30 minute run - I've been running in Freet barefoot shoes pretty much since I started C25K