So as you can see from the results posted - He ran 10.47 in HS and was a world junior champion. So for a guy like that who already has the speed it does not matter if he does 1 hr runs or 1 min runs. The point is what are the pre-req’s to run a 400 in 44 seconds. One of the main requirement is the athlete has to run the 200 in between 20 - 20.3 seconds. And to run the 200 in 20.3 you would need to run the 100 in 10.2. So if you can accomplish that by doing slow long runs - though i dont think so. LaShawn or his coach does not have to worry about that. Coming out of HS he was already running 10.47. So my point again is it does not matter what LaShawn does because he has the natural speed and most of the kids don’t.