It comes out at well over 10,000km even with the Amazon boat, which sounds to good to miss out on, and gives me the chance to cycle for about two weeks north through the Amazon Rainforest around the Equator (must be mad!).
The actual distance will be way higher, maybe a third more but possibly even double, as all the turns in the road are not counted, and the many detours.
I will add the alternative route that is in my head which avoids the Amazon boat journey soon.
Caracas is the end point at the moment, mainly do to it been the most Northern capital. I hope to continue on through Central and North America, but this is to far in the distance to start planning routes. There maybe a boat option to North Africa too, which would link onto South Europe well.......