I think you might be loading up a bit too much on the fast stuff if you use this plan. I suggest that you keep about half of your workouts longish steady state rows (30 to 60 minutes continuous) and do HIIT and intervals a bit more sparingly. The Pete Plan (google it, it's a great plan) lays out a week of training like thisLittle John wrote: I'm going to be using Greg's method twice a week, and HIIT twice a week.
steady state enduarnce row
short intervals
steady state endurance row
long intervals (2Ks or that 3'/1' kind deal)
steady state endurance
hard distance row
rest
If you do too much intense interval work, you'll get some short term gains, but cheat yourself out of real, long term improvements to your endurance.