The most marathons run on consecutive days is 52 and was achieved byAkinori Kusuda (Japan) on the Besshonuma Park Jogging Course, Saitama, Japan, from 30 January to 22 March 2009.

The marathons were organised by and the course was measured by the Saitama Association of Athletics Council. The final marathon on the 52nd day was the Tokyo Marathon in Tokyo, Japan.