My Great Building's bonus disappeared!
Great Building bonuses are usually available several times per day. As you use the bonus up, it will eventually disappear.
So if you've used all charges, the bonus will not show up in your city on that day again. You can see the number of remaining charges on the right side of the game by placing the mouse over the bonus. If you can not use the bonus on that day any more, the bonus icon will not appear.