I hate to say this, since I consider myself one of the more encouraging members of the touring forums, but I don't think that you realize the cumulative affect that fatigue will play on a long term tour. Even if you do regular fast centuries and even doubles and triples you won't know how your body will react to weeks and months of touring. There's a lot to do.

You ride all day, you have to set up camp, you have to find food, do laundry occasionally. There's bad weather, noisy nights, hills, bad roads, head/cross winds, you name it. You won't have your nice soft bed and regular lifestyle to retreat back into in order to recover.

One day, you're bound to wake up and feel like death. Everyones reserves have limits. You're liable to want a nice motel and a couple of days off, and that's when your time schedule and financial planning takes a tumble.

Not saying don't do it, just saying don't talk too loud until you've done it. Have some extra cash saved just in case, and don't set a date for the finish.