To be perfectly honest...I believe that any schedule should have some built-in fudge factor....one must consider the many possibilities that might present themselves. Bike mechanical breakdowns, highway accidents, illness, personal problems, death in the family, etc, etc.
And that would be with a very highly, structured, and dedicated(professional) group of riders. Considering our group doesn't really meet those specs, I think the fudge factor should be a minimum of a week or two. Add the fact that the ride route isn't even fixed per ride sector group, who knows when the package will show up at your door step.