Which one are you thinking of???
I want to do the Valentine Century in Sanford, Saturday, if the weather is nice. It's about 120 miles from my house. There's one Sunday, too, in White Springs, the Sweetheart Century, but I'd rather ride on a Saturday.
You're down in the "mountainous" part of Florida, so anything near you will probably include some hills, but I wouldn't think very many, and relatively short, though steep.
It takes me about 7.5-8 hours to ride a century- less than 7 for the actual riding, but lots of stopping and eating at the SAGs. The fast people are in the 5-6 hour range.
If you look at the Florida Bicycle Touring Calendar
http://www.floridabicycle.org/fbtc/
You can find a whole bunch every month.
Nanci
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"...I'm like the cycling version of the guy in Flowers for Algernon." Mike Magnuson