SDSU Aztec wrote:
at which point in time wrote:
In my opinion: a long time, and even then it would be psychologically difficult.
I think some of the other posters have the right idea that the shortest gap is likely to be for a truly great middle distance runner. But it is questionable whether anybody has ever been in shape to have done it. Ovett for example ran a half marathon in 1:05.38 in 1977 so could certainly have managed a sub 2:30 marathon around that time, and could do a 21.7 200m as a teenager, but it seems very unlikely that he was ever in shape to do both at the same time. Coe possibly had the speed for a sub 11 but definitely never had the endurance for a sub 2:30 marathon. One can conjecture that it might have been possible if they had done such and such differently, but that it is different from actually having been able to have done it.
Keep in mind that Coe and Ovett were genetic freaks. Their combination of fast and slow twich muscles is extremely rare.
During important developmental years of Coe's training, he was a low mileage 800m specialist who also raced other events. The intensity of training for 800m was buring Coe out. Coe did switch before 1984 Olympics and began training for 1500m but also raced other events. [The Lydiard fans on here love to point to Coe's training leading up to 1984 Olympics to state Peter Coe's low mileage statements were fraudulent.] S Coe, circa 1997 raced Twin Cities Marathon, about 2:50. He said he was only jogging 25 to 30 miles a week in 1997. [I hope the Lydiard fans do not state S Coe was secretly running 100 miles per week in 1997.] Wasn't there a MN high school girl from Woodbury, MN who raced Twin Cities Marathon, circa 2018 in 2:40? I cannot image 2:30 Marathon is that difficult for any sub-3:30 1500m man who wants to do it.