[CoDeZ]

Create a timer.
Example :

pawn Код:

forward CheckArea();
public CheckArea()
{
     if(IsPlayerInArea(Coordinates here))
     {
            //Do your stuff here.
     }
     return 1;
}

Then call the timer for example, every two seconds under on game mode init.

pawn Код:

// Under on game mode init
SetTimer("CheckArea",2000,1);