Well, if I was a betting sort of person, I'd guess at next week's ride day temps to be in the high 80s to mid-90s, so how long do y'all want to be riding in somewhat cool temps? I'm thinking 8-ish sounds about right. Even if we were to poke along at a conversational pace (which is sort of the point of this ride), and stopped at Steady Eddy's for a recharge, we'd still get done by around 2-ish, or so, which would keep us out of the worst of the heat if it was a toasty day.
Otherwise, does anyone have good friends along the route with garden hoses we can use?