There is a limited nr. of different missions that you can get, and my guess is that some of them, like destroying tankers and tenders, are more decisive for advancing in the campaign than other mission types. This, and because the type of regular missions you get is random makes for a longer or shorter campaign.
By looking at the event triggers, I see that a campaign can also end in a stalemate; it never happened to me, and I will not open the specific event file in order not to spoil myself...
All this, plus the fact that you are thrown back everytime you fail a mission can make a campaign *endless* I think, unless CW has a code to end the campaign after time x or a nr. of missions y, I don't know.
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