I've never done any serious, long distance, self-supported touring, and would like to get my feet wet. Due to limited ability to take time off, I'd like to do a 9 day, one way, 646 mile trip from my current home to Acadia National Park starting over Memorial day weekend. I'd like to do it entirely camping, with the exception of staying with friends 2 different nights, which will give me free showers and laundry, so I'll be heavily loaded. Daily distances are flexible, but I've mapped out a route with good places to stay each night with distances varying between 97 miles and 67 miles, with the exception of the last day, which is only 36miles. Due to logistics, the trip may have to be extended to a 10th day of 16 miles, and a 11th day of 17 miles. The route is nowhere near flat.
My closest experience was an attempted 2 day, 300 mile trip, with camping plus a credit car for meals, that sort of failed and ended up being 3 days, after failing to get any sleep after the first day. I've done a fair amount of backpacking and camping, and am comfortable packing very light. I really don't feel like biking 70 miles a day, over the course of 12 hours should be challenging at all if I'm in shape.
However, currently, I'm in what is definitely the worst shape of my life, need a bike, all camping equipment beyond a tent and sleeping bag, and will have only a few weeks riding outside before I leave. Spinning inside is completely different. I'll have had the chance to do a century maybe once or twice before that weekend.
I don't want to set myself up for failure, injury, or a completely miserable experience. Should I rethink this, and look for a shorter trip to go on?