If you are following the in-season plan that is posted on the website, that is definitely a high muscular endurance type workout. Just be careful with the amount of time prescribed to training and riding. I use that schedule with an ATV client of mine, but she doesn't have a job, is 18 years old, and has nothing but time on her hands. She gets plenty of rest between workouts and her nutrition is pretty solid. If yopu have a full time job and try to keep that schedule, you may start to get over trained. Pay close attention to Seiji's Recovery article we posted last week (
http://www.racerxvt.com/virtual_trainer ... seiji.html ).
As far as going 5 minutes longer than a moto. Let me explain. I use the actual heart rates of my riders during their moto to determine their heart rates during training. When we bike or run, I make damn sure their heart rates are at or above what they are during a race and for AT LEAST the length of the race. If they can make it through training which is longer than their motos, race day should be a piece of cake!
You asked "
One further question. To push 25+ minutes, what amount of time should I be doing cardio for? Should I work more on pushing 25-30 minutes, or pushing my base further by doing 45-60 minutes on the bike or running?" The answer is both! On high intensity days (usually early in the week) push hard for the 25 to 30 minutes. On lower intensity days, shoot for lower heart rate and go a little longer.