As far as Gains sciences go, the guide says "... improve your ability to capture enemy land resources." So sciences don't help gain more from learns/plunders. The guide doesn't mention the added hours option for attacking, so my question is this: Does adding extra time to your attacks increase the gains on learns/plunders? I'm thinking not. On the science page, it simply says +10% Gains in combat, but as the guide reveals, it only affects land gains. So it stands to reason that when you add 4 hours to get 12% more gains, it too also just affects land gains. Please correct me if I'm wrong.