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Takes 2 years. So you can reach 50% in 14 years for 175 PI. Probably a little less when you factor in the base civilization level growth.
If you're already at your maximum civilization threshold, the only other option you have is through technology, as each level of the Oratory tech increases the max threshold by 2%.
Oh, I guess there is the State Religion national idea which boost max civ by 5%. You could always take that regardless of whether you have a religious slot or not and forgo the secondary government bonus if you don't.
15% Federated
10% Centralization
5% State Religion
5% Tribal Law
5%~20% Center of Civilization when you become Federated