My tweaked knee is still tweaked as it has been for the last 3+ weeks, but I felt like running and came away with some (nearly) round numbers. 14.0/8:30/149 in 1h59m. It felt good to shake the rust off. I also like the ~2hrs, ~150 bpm, and 8:30 min/mi roundness of it all. Having a medium long run to go with your weekly long run is a necessity for marathon training in my book.
This 14 felt very easy. I think I've stretched my miles about the best I can with the 3 high days, 3 low days strategy. When the high days shift mid-week, I can't get anymore than about 14/day in the morning, so I'm stuck in the low 40's for my 3-day mileage total. I also think I need to add some speed endurance to my endurance.
So with a nod to the 7-day week and some inspiration from Joseph's comment, I'm thinking of doing
Mo - 60' ez
Tu - 60' ez
We - 14 miles moderate
Th - 60' ez
Fr - some kind of "workout" (could just be 4-6@80%) - total ~10 miles
Sa - 12 or 13 miles easy
Su - 18+ (building to regular 20+ milers)
Total - ~70 mpw
I've become a firm believer in the back-to-back thing so I'm leaving the Sa/Su. One of my biggest jumps in running came when "training" for the Disney Goofy Challenge (half on Sat, full on Sun) where I did 13 on Sat and 18+ on Sunday.