If the designers choose to take the more Historical path, each tech research could take(cost) each civ more or less time to complete, depending on each civ's preferences. Accordingly(somewhat) to history, Mayas could take much less time studying Agriculture and Masonry than Huns. On the other hand it could take Huns a lot less time to develop Archery and Animal Domestication(Husbandry) than it would take the Mayans. What I mean is a pre-set amount of (science) points needed for different civs to discover a particular advancement. Any thoughts?