Did you ride that kind of distance last year? How strong have you otherwise felt riding this year? Do you generally feel spent or sore or are you ready to get on the bike again the next day? Will you be dealing with any strong winds tomorrow?

Depending on how you answer those questions, I imagine you'll be okay. Tired, but okay. The break in between will hopefully revive you enough to ride home? Is there anybody available to bail you out if you get there only to decide that you don't have it in you to get home?