At the recent New York City Half-Marathon, 36 year old Chris Estwanik ran the 13.1 mile course in a time of 1 hour 11 minutes and 36 seconds. That pace was just under 5m 28s per mile.
It all started as a bet that he could set a new Guinness World Record for the fastest half marathon while wearing a suit. The previous record was 1:18:13.
Japanese runner Yuki Kawauchi has run 1:06:42 in formal attire but that was achieved on a non-certified course and doesn’t stand as an official record.