Hey, I am 53 and planning to walk from Leon to Santiago in late Sept of 2012. This is the first time I have done anything like this and am VERY excited. I have rheumatoid arthritis that is somewhat under control but limits me a bit. I will be a wanderer and not a fast walker. Friends and family have told me to stay close to or under 15 km per day (they have not walked the camino) but that doesn't sound like a lot. I will be traveling from the US so need to factor jet lag into the scenerio as well. Is 18 days sufficient to walk from Leon? Also, what can I expect from the weather that time of year?