Less than 24 hours.
I spent most of last night and some of this morning packing up for the ride. I have much more food than I need, but I suppose that is better than not having enough. It looks like it will be a cool day with lows in the 40s and highs in the 70s (that's Fahrenheit), so I am bringing a base-layer, arm-warmers, long-finger gloves, a skull-cap, a wind vest, and a waterproof jacket. It isn't supposed to rain, though.
I think I have all the right gear, and I think I have enough training miles in (though, just barely enough). I'll report back as to how prepared I really am.
Meanwhile, I have to go scrounge up some carbs.