I'd say 10k is probably enough - just try and avoid hotels like the plague, and spend as little as possible on the bike (without getting a complete lemon, obviously!)
My next big trip is for 4 years and I will have about 40k once I've sold my house - the tricky bit is to keep reminding yourself that you have to live within very meagre means when you have a healthy balance at the start - no hotels!!
As for not knowing what will happen at the end of the day - thats the best bit!
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