What Yakobu said is correct. The number of turns is dependant on how long it takes to fulfill the campaign goals, ie hold a certain amount of provinces and eliminate one or two of the neighbouring factions. Ie everything from 1 to 200+ .
When you complete the goals you are asked after the victory video if you want to continue playing. The campaign then becomes a standard long campaign, ie hold 45 provinces and Jerusalem or some other province.
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