Originally Posted by
jsigone
double what you are doing now as a base then add 10% per week leading up to the event tou shouls have a few 70+ miles under your belt. Do some hills too. Most long rides have climbing in them.
^ This is good advice. The key is saddle time. Set a goal for the amount of time (hours) you want to spend in the saddle each week. This is more important than miles as your sit bones will wear out long before your legs will.