If the course is near your house, I would ride it just to see what you are going to be up against. Get to where you can ride the entire course before the date of the scheduled ride and you will have it made. I did the MS 150 Citrus Tour in May of this year and there were plenty of hybrids doing the century ride the fist day and doing the return 50 mile ride the next. The bike will do it. Just get out and ride a lot so that you can do it. And we all know that you can.
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HCFR Cycling Team
Ride Safe ... Ride Hard ... Ride Daily
2017 Colnago C-RS
2012 Colnago Ace
2010 Giant Cypress