Since mid November - following the Brampton 10 mile race - I have ran my 5 mile circuit many many times. Sometimes because I couldn't be bothered to do a 'proper' training run but more often because I didn't see any requirement to run further. I always ran it briskly but not flat out and I always hoped for a 30 minute time but never got inside 30:30.
With last nights mile reps in my legs I struggled a bit tonight with 31:30. That's it now though - no more of these for a few months. A longer slower run will replace this on a Wednesday night, and any other night when I might have done the brisk 5 I will be more likely to now do a recovery run instead to help get over the ever increasing marathon mileage.