I personally think you'd be better off taking a lot of longer subs to get a higher SNR on the darker areas and then just take a dozen or so short subs because it will not take much to get a really high SNR on those very bright areas.
Lots of short subs will get a very clean core but a single long will be incredibly noisy. The short subs are only for restoring the blowout on the very easy to capture areas, everything else is for actually capturing your desired image.
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