Collin Allin, 41, and wife Hilda covered the 42.2-kilometre distance by running more than 2,100 laps of their 20-metre long balcony from dawn on Saturday.
Controversy over Nike's hyper-advanced Vaporfly shoes that some say give runners an unfair advantage boosts performance of some of the sportswear giants' rivals.
Peter Snell, who is regarded as one of the greatest middle-distance runners of all-time, won the 800 meters at the 1960 Rome Olympics aged 21, and the 800-1,500 double at the 1964 Tokyo Games.
About 5,000 runners competed in the 42-kilometre marathon which started on the Asian side of Istanbul’s July 15 Martyrs’ Bridge and finished in the historic Sultanahmet Square on the city’s European side.
The feat by Eliud Kipchoge is the largest single improvement on the marathon world record since Derek Clayton improved the mark by 2:23 in 1967.
Kenya-born Rose Chelimo was in the lead by the 30-kilometre mark and won in 2 hours, 34 minutes and 51 seconds.
They are aspiring ultra-marathon runners, hoping the sport will put their remote village on the map and provide the funds needed to rebuild homes destroyed by 2015 earthquake.
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