I will participate in 2013 brevets. I am using LT zone specific training. I am training weekdays and need to lose weight/build base miles for 5 weeks then I'll do some more specific workouts. I'm confused about something. Why do people say you need at least 2 hours in zone 2 to benefit endurance? I only have time to ride an hour a day currently on weekdays. Cycling plans generally suggest zone 2 for base miles.