According to Official Guinness Records,
The farthest distance to push a scrum machine in 8 hours (relay) was 58.56 km (36.39 mi) by members of Burton RFC (UK) at the Shobnall Leisure Complex in Burton On Trent, UK, on 10 July 2010. Participants consisted of team members from the U17, U19, and Seniors squads, who pushed the machine around a 426.1 m (1,398 ft) circuit.
For a complete list of 2010 records, please visit 2010 Guinness Records in United Kingdom.