I ride a century every summer. It's a benefit ride for a cancer center and that's kind of what keeps me going mile after mile. I love the ride itself, but I hate training for it. I don't really follow a "plan" other than to keep increasing my mileage and then do a few long (75-90 miles) rides in the weeks leading up to the century. The benefit ride is mostly in NH (I'm in Northwestern Vermont) so, I never get a chance to ride the event route until the day of. If you need/want a "so and so did a century and..." you can use this one: "vermonster rides centuries and she's completely out of shape!"