Simple summary of all base training discussions:

If you've got 1 to 1.5 hrs. of riding time on weekdays/workdays, and/or are on an indoor trainer, ride with higher intensity. If you've got time to do 3 hr. rides everyday, go and do them. On weekends, or whatever day(s) you don't have other life obligations, put in a 3 hr.-ish ride at terrain based intensity and have fun doing it. When you get closer to race season, you get more specific in your workouts, then when race season begins, you race, recover, race, recover, etc.