Going stupidly into a century on crap mileage - doable?

[zoom-zoom]

You can do it. You may be sore afterward... but if you want to, you can do it.

I guess I know I can do it...but I don't want to be bringing up the rear and struggling to keep up or forcing others to soft-pedal for all those hours, since it's a sort of social century fundraiser for a friend's scholarship fund in her dad's name. The party doesn't start until everyone is done. It could be a long wait for everyone else...