Seperate Turn Duration for each player in Turn based games

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In my game There are Two Players ,I want to give separate turn duration for each player,and when the turn Duration expires the turn should be passed to opponent player,
i am assigning 30 seconds to turnManager.TurnDuration. When TurnDuration Expires both players passes the turn,but i don't want to do like this i just want to send only only players turn
how to to this can anyone tell me.