Thanks Martin, Actually the clouds were rendered at 216 samples with the acceleration cache set to none highest quality. The Atmosphere samples were set to 100 and I seldom go over 75. I think the sky portion took around 25 hours to render as it is and I don't really care to spend anymore time and power consumption at this point. I'll send you the atmo/cloud clip via email.
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Thanks for explaining and the file!
Martin