How long did Edwin Moses hold the 400 meter hurdles record?

Ed Moses set his first World Record on the 25th July 1976, bettering it in 1977, 1980 and 1983. it was finally beaten on the 6th August 1992 by Kevin Young. Ed Moses held the World Record for 17 years and 12 days. He also was unbeaten in a race for nine years, nine months and nine days.