It depends on how quickly you want to do the century. If you want to just complete it, it's not a huge deal...

I'm still a novice, but I've done the distance almost 3 times. Though I maybe shouldn't have technically done any of them. I'd done at least 60 miles a time or two before them. One time I crashed (not bonked, but hit the pavement) 93 miles in, that was with a 70 mile ride the day prior and 100 miles the day prior to that. The first 100 that week was hard, fairly windy, but okay. A better experience than the first time around. And the 93 was REALLY hard, wind and rolling hills. That was a test of morale. Then I hit some railroad tracks.

The first time I did 100, I can't remember how many times I'd ridden 50+, I know that I did nearly 70 on a ride before that. The last 25 that time were hard, I was by myself that 25 and I was tired and cranky. But I expected something different.

Get as many miles done as possible before. And after that, it's really just 4 25 mile rides, especially if you have all day to do it. It takes me like 6+ hours. I'm a slowpoke.

Is there a ride that you're hoping to do?