This is the standard game of Hundred Years War, with four seasons (turns) a week. Updates on Sunday (Fall), Tuesday (Winter), Thursday (Spring) and Saturday (Summer). Because there are four updates a week, the seasons fall on the same day of the week each year. The middle of the week is deliberately Winter, as this is the season in which few players campaign. Most of the good campaigning weather takes place on the weekend, when most players can spend more time at it. While the game updates start on a set schedule, they may be thrown off by missed updates and other Acts of God, so your game may vary from the ideal set up in the docs.