Modules are two weeks each, though there is an extra week of administration at the end of Mod 5.
Roughly they worked like this last year:
Mod 1: Fundamentals - weapons (C9, Grenades), theory, communications.
Mod 2: Navigation and fieldcraft, and a quick course in urban operations
Mod 3: Offensive operations (Section Attacks)
Mod 4: Conventional ranges
Mod 5: Recce patrolling, defensive operations, and unusual operations
I'm told that mods four and five have been reversed this year, and that the intent is that 1 and 5 will not necessarily need to be conducted in Gagetown, they could potentially be done at local levels.