Well, the first week I would walk for 1 mile....that usually took me a little under 20 minutes. Then, every half-mile, I would run 2 minutes. So once I hit 1 mile, I ran for two minutes. Then walked until I hit 1.5 and ran for another 2 minutes and so on (I did this until I hit 3.5 miles, then walked another half-mile). On my 3rd run for the week, that changed to 3 minutes instead of 2 every half-mile.
Now this week, my first run was walk briskly 1.5 miles. Run 5 minutes, walk 5 minutes. Do this 3 times. Walk 1-2 miles. This took me a little over an hour. So in the beginning I'm walking much more than I'm running. But in all I'm hitting around the 5 mile mark. It progresses as you go on.
I found the program on the Fitness Magazine web site under "Workouts" and "Running". It said something like "Beginner's 5K Training Program". If you'd like the link, let me know!
And yes I agree with Nikaia that the C25K program is the most basic. I think it's really for people who have a tough time making it through a long workout, or for the time-crunched. But like I said, the C25K wasn't EXTREMELY easy for me...it was just that I wasn't losing the weight, and I wanted to challenge myself a bit more. And like I said, it's all about personal preference.