Originally Posted by hamster

This sounds extremely high to me. By this logic, in order to do a successful double century, I need to average 330 miles per week (1300-1500 miles/month) by riding 50 miles/day 4 days a week and 150 miles on the weekend. At 14 mph average, it's 23.5 hours/week on the bike. This is just nuts. I did 5 doubles in the last 1.5 years, granted that I don't train as much as I should, but I don't average anywhere close to 330. I did 280/week for two consecutive weeks once and that was exhausting and very time consuming. My hardest double was completed with ~100 mi/week average over the month prior to the event. (OTOH, 50 miles/week is not enough to maintain shape for the same distance.)