I'm using all of September. My estimage of 18 days is max balls out riding every day so I have the extra time built in. Point taken about the weather but i'm commited to September.
Agreed also by my milage estimate, it's been a while since I updated that but have now fixed it (current route..which will change is 12,800km).
What I'm really looking for at this time is suggestions and ideas of things that I might otherwise miss on my jouney around. From reading another RR I've added Monument Valley for example. In another a museum in Birmingham (still trying to work out the best route for that). So it's things like that.
Keep the feedback coming, it's all welcome and it's all helpful :)