Earlier quoted context omitted.
I should note I spent the first month ramping up from 20 min of jogging to 45 min of jogging which is why I put 6-7 months. If anyone decides to start jogging based on what I wrote, please don't go from nothing to 45 min a day. I didn't do that.
http://www.pcosfoundation.org/5K%20Running%20Guide.pdf I'm about to start something like this as I have the 'losing weight but losing it from the wrong bits' issue mentioned in another post. I am physically active, I don't drive, I walk around 3 to 4 miles a day as part of my commute, I go up and down three or four flights of stairs quite a lot of times a day (I'm a teacher and timetabling systems seem to have a Salt…
During the first month I did 5 min of stretching and then 20 min of jogging in one shot for the day. Every 3 days I would try to add 5 min. Sometimes I could, sometimes I had to back off and try a few days later. After a month I got to 45 min. I then did only 30 seconds of stretching before the jog. I did't think I needed it anymore (probably should have).
As I understand it the first 20 min of jogging doesn't really help you lose much weight, it's every minute after, for the session, that really burns fat.
As for miles walked, this was 14 years ago I didn't think or care about miles walked.
Probably not helping you, but that was my experience.