I agree with 10 Whyeels. If your normal pace is 16mph, you will spend a little over 6hrs riding. Add whatever time you plan to spend at ALL the stops, and that would make a good starting point. Just be aware that you may not be able to keep up your 'normal' pace for 100mi of hilly route. If your pace drops off, just go with it. After you finish, you can better judge what time your NEXT one should take.