I started back in January doing mostly walking for 30 minutes (6 days a week). Now I am doing 75 minutes a day and one long day on Sundays. Last Sunday I actually completed 2 hours of walking/running. I walk 6 minutes and run for 2.
I have a TV/DVD player in front of my treadmill and last Sunday I watched the movie "Secretariat" while I was run/walking (8 miles). It made the time go by so fast - I was amazed that I was on the treadmill that long. I need another good movie for this coming Sunday (9 miles).
It looks like you're doing well with your running, nuumite. I think it's actually harder to run on the treadmill than outside (they actually say it's easier but I don't believe it). Good luck with your goal of 3-mile running!