NHF – new heroes for Heroes V 3.1.

Slightly off-topic, and I apologize for that, but I'm curious about a specific game mechanic. Does anyone know how often that random number in the Recruitment Threshold changes (e.g., when loading the game, on the next turn, on the next week, etc.)?

Recruitment_Threshold = (random number from 1 to 7) * Morale_Coefficient
Combat_Threshold = Recruitment_Threshold + 3 * Morale_Coefficient
» Interval 1: If Strength_Ratio < Recruitment_Threshold, the neutral army engages in combat.
» Interval 2: If Recruitment_Threshold < Strength_Ratio < Combat_Threshold, the neutral army joins for a fee.
» Interval 3: If Strength_Ratio > Combat_Threshold, the neutral army joins for free.