Thanks for the clarification. Yes, and I actually personally prefer the opposite of what the schedule in "Run to the Top" says: I like shorter, faster runs on more or less flat course and lots of hills on longer, slower runs. As you know, even Arthur said (in the book) the longest run of the week over "flat" course, Waiatarua is known with monstrous hills.
When I trained this young lady who never run more than 1:20 (only once) before we got together, I laid out so she would do, say, 2-hour flat first, then 2-hour hilly course; then move on to 2:30 flat, then 2:30 hilly... It worked really well.