First, you will need an Inn at any level and Feasting Hall to level 3 or higher.
Second, recruit a hero with high politics. High politics cuts down construction time and increases your resources.
Third, recruit a hero with high attack. High attack cuts down the time of training your units at the barracks.
Fourth, recruit a hero with high intelligence. High intelligence cuts down time researched at the Academy.
Lastly, put your high politic hero at mayor. Click feasting hall, then it says Appoint Mayor, appoint your high politic hero. When you want to cut down your other timers, switch the mayors. Dont worry, everything will go back to normal once you get your high politic hero at mayor position.