Need 1 day for relax
Among the challenges you must have at least one day to relax or to complete episodes of the game, to gain experience, food or influence by the various missions. As it is the game takes too much effort. You could reduce challenge missions from 6 to 5 and extend the duration of the challenge in four days, with a day off before the next challenge. In this way the player would have time to catch a few hours of lost game or take to the limit the number of stars per mission of the challenge (which in my opinion is the most beautiful part of the game and technique). Also you would have a long day to do maintenance to the game without having to do ongoing challenge as this week.