When you are in the game, at the bottom of the screen is a row of special abilities (when you get them). From left to right they are first green (I think--haven't been in the game for a while) then yellow. The green ones (or whatever color they are) are passive and always in effect. The yellow ones you click on. These abilities have a time limit. An icon appears in the upper right of your screen showing a count down clock which gives you a visual of how much time is left for that ability. Once you try it your will understand--fairly simple.
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