BigAura

To me it's not clear that you are are talking about 100-miles-a-day OR a total trip of 100 miles? If you're talking about 100 miles out and a 100 back weekend trip I'd say you're probably in way over your head. Back-to-back centuries are particularly difficult and require an even higher fitness level than a single day century.

I agree with the others that say to get your rides up to at least 50 miles on a consistent basis before attempting the century. Besides doing the ride, be sure you're prepared for the number of hours in the saddle. You'll need to be sure to start early and/or be prepared for darkness, especially in winter.

EDIT: If you're talking about 50 miles out and then 50 miles the next day, I say go for it. On flat Florida terrain this should be doable at your current level.