How often do Senate and World Council votes occur?
Solution 1:
Interestingly, I have done a bit of research into the exact time of this, but I am unable to clamp down a time. I have only seen it mentioned as "I voted for x this week" - so I can logically deduce it's 7 days. However, Global Events end every 30 days, so either:
7 days OR 30 days.
Logically: 7 days because of the bonuses it provides and players may want something different in their Anno 2070 democracy that week.
Best guess: 7 days.