Page 19 of the document:

[quote=Rules]The units of time are as follows: 24 hours to a day, 30 days in a month, 4 months in a season, 4 seasons in an annum. Each round of orders [see below] consists of a season. The seasons are the Waiting, the Working, the Growing, and the Harvesting.

The game will begin in the Waiting Season. For each round, every player must send a list of things they wish to accomplish to the GM via PM,called your Actions. The GM will tell you if these things are capable of being accomplished, but so long as they are within your means, you should be able to accomplish them. These orders may be as simple or ICly elaborate as you desire.

A round of posting is completed when each player has made their orders, and all battles have been resolved, [b]or a week of real-time has passed[/b]. Specific units of time are meant to aid in the deliberation of time, and not all units will necessarily come into play.[/quote]

Incidentially this means a year has 16 months in this world. It's not entirely clear but I assume a season is the same as a round of posting, meaning a season equals a real life week.