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It's trail and error with me anyway....
It's going to depend on ISO speed, focal ratio, aperture and skyglow plus other factors.
A good way to start is with ISO 800 - 1600 and do a 1 minute exposure..then 2 minute then 3 then 4 and so on...you will soon see if the image has been taken over with too much skyglow or is over exposed.
I dont think anyone could tell you exactly what timed exposures to take....you will also have to take into account what your imaging...too many factors for me to work out....so just do what I mentioned above...experiment...you will soon know approx what times you need to set your exposure length.
Hope this helps a little
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