Every turn in the Heroes games constitutes a day - once every single player has taken their turn, the day is over, and a new day begins. Every seven days, a new week begins, and every four weeks, a new month begins. Every town can build one building per day, and every dwelling gets refilled with new creatures every week, except in Heroes IV, where a few creatures appear every single day. Some scenarios have time limits, where the player is given a certain amount of weeks or months to accomplish the goal or suffer defeat.