That's interesting to see the numbers Ray. I too have had experience with shorter subs (3min) and found that the FWHM of the final was better, probably because you can be picky given the number of subs available. But read noise was an issue. I've never experienced long uninterrupted subs. Don't have an obs and there's always a wind gust, a cloud or plane that's bound to stuff one up. Want to make the most of your setup time.
