Since the launch of Age 2 , you have to check back in all the time to keep building going. You may often lost track of time and forgot about it. Now there is the new Item Bernini’s Hammer. (Edit: This is now available for Age I). It is VERY useful in that you can schedule tons of construction queues back to back and walk away from the computer and not worry about it for a few days until the queue is done. Awesome tool. This Will save some new players losts of frustration by spending a few cents.
Note: in case you are wondering, the name Bernini comes from Gian Lorenzo Bernini http://en.wikipedia.org/wiki/Bernini