Forty Years puts you in charge of getting six hundred thousand people across a desert on eleven days of food. Each day follows the same rhythm: the pillar of fire decides whether you march, you decide how to ration water and grain, manage flocks and silver, and respond to events that push two linked meters, faith and grumbling, in opposite directions. Pick a calling that shapes what you start with, keep a running journal of what happened, and see how the twelve tribes hold up by the time you reach the Jordan.