Tim,
You can do it! I rode to my first national rally in 2000. I'd had my Concours a bit over a year. I left here, rode to Brian Head, UT (spending nights with my son in Montrose, and my folks in Grand Junction), then left Brian Head, rode to Vegas to put a Swedish friend's wife on a plane heading for Stockholm, then came across country to Mountain Home, Arkansas, in four days. When I left Mountain Home, I spent a night with friends in Bella Vista, AR, then went on to visit an aunt and uncle in Kansas and made it home after two great weeks.
I've found that I can do 500 mile days easily in the summer. I eat breakfast and try to be riding by 8:30 to 9:00, then ride till 6:30-7:00, which gives me plenty of time to rest, eat, sleep.
Expand your horizons! Like the Iron Butt Association says, when you realize you can ride 1000 miles in a day, it makes the country a lot smaller!