Is there a difference between a short campaign and a few nights of gaming with the same PCs? I have played in a few 1-shots where the DM told us to bring a 5th level PC for an adventure that turns out to be only a few nights of play. I would not call it a campaign though.
For me, a "campaign" means more than one adventure. Typically, adventures take 2 to 5 sessions to complete. So I think a short campaign is about 15 sessions, give or take a few.
