Zeke, do you know where you read that about the runs? I remember something similar about fat utilization but I don’t remember it going anywhere beyond that. Aerobic development seemed to be consistent. I’d be interesting in reading this if you knew where you got it from.
If you look at the Hadd outline, go to part III. Towards the end of this section he states “Although Dudley found that 90 mins was not better than 60 mins, Holloszy had shown that 2 hrs was definitely better than one hour (which ties in nicely with Lydiard-type training recommendations that one 2hr run was better than 2 x 60 mins — you have to admit that the guy had great intuition born of his experience trying out different training on himself).”