What is the longest-lasting non motorized sporting event in the world?

In the Olympic and Commonwealth games the marathon is the longest non-motorised sporting event.

The Iron Man triathlon is the longest recognised sporting event held in one day (2.4 miles swim, a 112 miles bike and a marathon (26 miles 385 yards, 42.195 km) run)

The Tour de France cycle race is the longest non-motorised sporting event in total and covers approximately 3,500 kilometres (2,200 mi)