A backyard-format event based on a repeating 4.167 mile (6.7 km) loop completed on the hour, every hour, continuing until a single runner completes a final solo lap. The course location and surface details should be taken from the organiser’s page, as this varies by venue (farm tracks, grass, trail and similar). Race-day logistics are defined by the standard backyard rules, with the organiser’s information covering registration, venue set-up and any site-specific requirements.