References:
Documentary by SuperSports360 following 2015 South-East Asian (SEA) Games Marathon Champion, Soh Rui Yong, in the final weeks leading up to his debut marathon - 2014 California International Marathon. There, Rui Yong ran 2hr 26min 01sec to set a new Singapore debut record, and qualify for the 2015 SEA Games, where he won gold in the marathon.
p.s - The Singapore Nataional Marathon Record still stands at 2hr 24min 22sec, set by Murugiah Rameshon at the 1995 SEA Games in Chiangmai, Thailand.