Marathon Training Mileage
Justin shares his experience of building up his mileage before starting his marathon training, going from running three to four days a week to gradually reaching 20 to 25 miles per week over six to eight months.In this clip
From this podcast

The Strength Running Podcast
129. How to Run a Faster Marathon: A Case Study
Related Questions
How long should your long runs be for marathon training, time-wise?
What should my ideal weekly mileage and long run look like going into marathon training?
When training for a marathon, does it matter how long your runs are or just the frequency of which you run? Would I get the same effect from running 6 miles in one session as I would from running three 2-mile sessions?