I am getting back to clouds and skies now,
though once more experiments, on how to create new cloud types, like the funny one a bit to the left
but also about getting different effects and studying render time
it was actually the one in the middle that took longest , maybe around 20 min at this resolution, which is the one the current ones have (4096x1024), bringing it up to 8192x2048 would take around 4 times longer)
It also depends on the type of sky and where clouds are.
I once rendered many clouds in the distance / horizon which was much faster than instead a few clouds right above the player in the zenith. Which means I can save render time when creating a sky like in the first image where are no clouds directly above