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Andy,
I’m certainly no expert but I’ve read Allan Halls book on Long Exposure Astrophotography and he talks about “read noise” every time you open the shutter and “shot noise” which relates to exposure time
He recommends longer exposures or a mixture of both to large numbers of short exposures. The increased read noise cancels out any advantage you may get from shooting shorter exposures
I guess you just have to experiment yourself as your capture settings vary from object to object and seeing conditions change from night to night
I guess there’s no real fixed set of rules, just recommendations and trial and error
Cheers
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