I keep a copy of Jason Massie's training plan handy as he is also doing the Rocket City Marathon on December 12, 2009 as a Boston Qualifier. I find myself comparing what I laid out for myself vs. what he has laid out for himself.
With workouts like today, I try to keep things in perspective and remind myself of a need for patience. His plan was calling for a 20-miler at 8:10 pace. I love the way he builds in progressive overload on speed and endurance. For example, he would do progressive long runs like the following;