Day, night, weather, sandstorms and such will all be implemented. Project Entropia will stick to the 24-hour cycles we use on Earth but the days and night will be divided into smaller pieces in a way that you won't have night every time you login at 9 pm. With the 24-hour in-game time it will be possible to experience nights two times or more during a given day. But the advantages are that you won't have to care of any Project Entropia time zone converter. If you tell someone to meet you in 48 hours then it is 48 hours in game and real life and nothing else. Also Project Entropia will have animals that appear only at night.