Each week you will be asked to complete a certain amount of Orders. If you beat this goal, you will be rewarded with additional Favors, as shown in the image above. The bar on the right-hand side of your Order Board menu indicates how long you are progressing towards your weekly goal, and the timer at the bottom of the Order Board menu indicates how long you have left to complete your weekly challenge. Once this timer expires, you will receive new Orders and a new weekly goal. If you do not hit your weekly goal by the time the timer expires, you will not receive additional Favors as a prize. 

If you complete all 15 Orders before the time runs out, you will get special orders, which brings you more Farm Favors and Coins than usual orders.