Its 43.18 seconds held by Michael Johnson
Wiki User
∙ 13y agoMichael Johnson world record: 43.18.
World Record 400m Individual Medley Michael Phelps (USA) August 9, 2008 Time: 4:03.84
Andy Morez
It's somewhere around 44 to 48 seconds
Marita Koch of the GDR holds the record at 47.60s.
Stephanie Rice
Michael Johnson
Michael Johnson
dont have a clue
Michael Johnson
46.70 by Kevin Young USA
2:54.20 by USA in 1998