Google for some starting timing. Nightscenes (except for the bright city lights) are EV -1000000 or something (OK, I exaggerated) so a meter won't help much. You also need to know about the reciprocity factor (aside: Acros-100 is really good with not much extra exposure needed so may be you should start with that). Also remember that lets say your starting time is 8 minutes, then another 4 minutes would only give you half a stop more. In other words, 8 minutes is not a whole lot different from 9 or even 10 minutes.
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