Polls close at 7:00 AST. [6:00 EST / 3:00 PST]
If I remember correctly results start trickling in after half an hour.
[My memory of which elections that is true are rather dim, if someone else in NS wants to correct me.]
It the actual results are anything like the polling numbers, things will start being called pretty quickly. Ditto for when/if a NDP government, at least a minority, is called.
People could post where you can get the quickest live results on the web.