Quote Originally Posted by wossy
I'm in agreement with Max on this.

But in any case an exposure of 10 seconds will give you all the Naked-Eye Visible stars and also a few of the brighter non-NEV ones. Much longer than that and you'll end up with lots of unsightly noise in the images.
I'll take Max's plan into consideration. I'll struggle a bit with the maths (judged from the link he included in his post) but I'll give it a shot in any case.

As for the exposure time, I actually found this page. Very informative.