How long a world lasts is dependent on the players in that world. Most SHK worlds last a number of years. Once a world ends we encourage players to jump straight into a new world. With the knowledge and experience you've gained, you will have a lot of fun rebuilding your villages, optimizing your research and making new friends. Cards, Cards Points and Premium tokens are available across all Worlds. All Worlds are separate, gameplay features such as research, rank are not copied across.