Now, when I look at a week I don’t see the necessity for mileage, I see the necessity for hard, quality workouts followed by adequate recovery and even making sure to over-recovering (if there is such a thing). -Ryan Hall
MY COMMENT: Hard to argue with a guy that recently ran sub 2hr 05 min. I understand Hall is even taking days off now following hard or long workouts.
I took the quality approach in preparing to run the Seoul Marathon in March, setting a goal of running 26 sub 7 min miles in a week. I was only able to hit 25 twice using a mix of tempo and long intervals in the dead of winter, but it definitely paid off. But prior to getting into that I did a stretch of just miles (6-8 weeks) to prepare.
It was former Olympic champ and PhD Exercise Physiologist Peter Snell who perhaps summed it up best when he said "The ideal training is the maximum amount of race related pace running you can do without overtraining".