So, after the last run, where I felt I didn't need the walking breaks after the 17 minute running intervals, tonight I thought I'd try for 2 lots of 25 minutes, and see whether I needed the break when I got to it.
I didn't need the break, and carried on right to the end of the 51 minutes. Then, as so often before, my slight OCD tendencies took over and wouldn't let me stop at 6.67K, so I carried on. Next time I looked at the Garmin I'd passed the 7K mark, so I just had to carry on to 7.5, especially as that's what I managed last time out. Then when I got to 7.5K, I'd been going for 57 minutes. I couldn't possibly stop having got so close to an hour, so I carried on. Then finally, when the hour ticked over, I'd done 7.89K, so I carried on to the 8.
I can't believe I've actually just run for a solid hour!! Blimey!! Seems I was right about not needing those breaks...
Think I might stop pushing for a couple of runs now - time to consolidate, methinks...