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Yeah depends on the seeing. The quality graph in AS!3 is relative, so you can have a plot that looks like there are only a few good frames and the rest are trash, but it can also be that most are decent and a few are great.
FWIW, if you look at my shots, Jupiter was a result of 25% of ~8000 and Saturn 33% of ~8000 frames. There is a tipping point where the number of frames stacked to reduce the noise (and thus improve SNR) also starts “reducing” the fine features too but it depends on the data, so experiment with multiple stacks to find the sweet spot - if you enable the Sharpening checkbox with 0% Raw blend then you’ll be able to see what I mean.
Just to echo what Jeff said, don’t be shy with the gain. My rig runs at about f/15 and I was using gain 350 on Saturn with my ASI462, which is the limit of analogue gain. Stay away from the digital gain that comes after that (higher values). The gain range on the 290 and 462 is the same btw.
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