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Max exposure time can be till your battery goes flat. But it will be hell noisy!
But with my 8" f/4.6 scope, I could get maybe 7 min @ iso800 before LP becomes a major issue. Your 8" f/6 newt would go maybe 12 min at the same iso.A lot will depend on your system speed and how much LP you have. (My LP is only minor) You also have to consider thermal noise in as well. As the longer the exposure the more noise you shall get, especially on the warmer nights, ICNR can remove most of it but it will still be noiser than shorter exposures.
The only way is to experiment and see how far you can go?
cheers Gary
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