I am not able to denoise any of my mosaics because none of them is complete, even after 5 hours. The night is not long enough to produce a 2x mosaic. There is no indication of when a mosaic is "complete" and you can stop acquisition. And when AI Denoise does work on previously acquired 1x images, it will not save the result in FIT format, just JPG. For this reason I find both these new features, AI Denoise and Mosaic mode not very useful.