Clark said:
I have a question for people is 2 short workouts just aseffective as 1 long work in the same time? I trying to increase my riding time to be comfortable at raceing 40 miles but I short on time at night to ride 40 miles but I can get in a hour at lunch and an hour after work.
It sounds like there are really two questions here: Can you break workouts down into two sessions in a day; and how to build indurance for a 40 mile race. Spunout gave good advice about using the short workouts for intensity and the do endurance when you have more time. But it sounds like you are thinking that in order to train for a 40 mile race, all your rides have to be 40 miles. Fortunately for you, this isn't the case. You can build your endurance base with only one long ride a week, so do this when you have more time (like on the weekends). The other workouts should be shorter, high intensity training. I think you'll find that if you combine the two - one long ride per week, but several shorter, higher intensity rides - that you'll actually be stronger both during and at the end of the longer rides.
(In contrast to shawndoggy, I think that sometimes two shorter workouts can be better than one longer workout, if you are doing very high intensity intervals. The small recovery between the workouts lets you do the second set stronger than you might if you strung them all together - of course, after the double set of workouts, you need to schedule enough recovery time to rebuild. But this double workout regimen is only better for very high intensity work - for training endurance, you have to do one long continuous workout.)