The default minimum research time is 4 turns. You can change it in the editor (I think? omigod, I'm not sure!).
If other civs already have learned the advance, it may actually take you less than 4 turns total (e.g., after one turn, it might be 2 turns to research instead of 3). Doesn't apply to Modern Age, but you must be in contact with the other civs for this to apply to you -- explains why research goes faster after you have discovered everybody.
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JB
I play BtS (3.19) -- Noble or Prince, Rome, marathon speed, huge hemispheres (2 of them), aggressive AI, no tech brokering. I enjoy the Hephmod Beyond mod. For all non-civ computer uses, including internet, I use a Mac.
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