In order to have coordinated traffic signals, each traffic signal in the group must be able to allow the green light for all movements during a common fixed time period. The time period chosen is usually determined by the largest intersection with the most different movements. This will most often be an intersection that has protected left turn arrows for all directions and wide cross streets. For that reason, the time period that is fixed for each traffic signal (the cycle length) may be rather long.
So, if you are waiting for a green light to cross the coordinated street where there are protected left-turn arrows and there is very light traffic on the side street, chances are good that you will feel like you are waiting for a long time, even though you should rarely have to wait any longer than about two minutes.