You could try every street within a 5k radius, might be better suited to a bike though.
Tim Wardrop mentioned that he was thinking of that and then realised it would be over 1000km.
So that's a tad under 24km per day
Which would be hard to do in an hour.
Nobody said you had to use the entire 5km radius. Why not do a 2km radius? Scaling suggests that would reduce the distance to 16% of the amount for a 5km radius. That should be doable.
Noticed a bucket load of new tracks in some local forest. Running all the tracks in the forest block might actually be useful.
Which forest, could give that to James as a project.
2km is definitely in my thoughts. Have already done a lot of the eastern half through covering Fairfield/Alphington; the southern part of the circle is mostly parkland but just gets into the bottom bit of Willsmere.