This will get you all positions in a webwalking path, I guess you could use path.length()
WebWalkEvent event = new WebWalkEvent(position);
event.prefetchRequirements(script);
Position[] path = event.getPositions();
I'm pretty sure GraphicsObjects is just everything that has a model and can be rendered. I'm not sure what the teleport thingy is though, isn't it just some animation?