And in that time , the sport has only grown exponentially in popularity .
In the last 40 years , the record has only dropped three and a half minutes , from 2 : 09 : 36 in 1968 to 2 : 04 : 55 today .
In that time , the sport has only grown exponentially in popularity .
In the last 40 years , the record has only dropped three and a half minutes , from 2 : 09 : 36 in 1968 to 2 : 04 : 55 today .