If i use the "Agoge" policy, it takes just as long to build a Spearman as it does without the policy in effect. Archers and Warriors both build faster however. It seems like a bug that it does not help to build the Spearman faster, since it is a melee unit. If it matters, i am playing as Trajan and am still in the ancient era. My city produces 9.4 hammers and when running Agoge it takes 7 turns to build a Spearman (65 hammers), 4 turns to build an Archer (50 hammers), and 3 turns to build a Warrior (40 hammers). You can see the math shows that Agoge isn't helping the Spearman at all.