[[MM]RoXoR[FS]]

That's easy to make.

• Create a global variable for each player
  pawn Код:

  new ChatTime[MAX_PLAYERS];

• When Player Connect set value to 0
  pawn Код:

  public OnPlayerConnect(playerid)
  {
      ChatTime[playerid] = 0;
      return 1;
  }

• When he enters text get time.
  pawn Код:

  public OnPlayerText(playerid, text[])
  {
      new time = gettime();//get current time in unix
      
      //see if difference is less than 3 seconds
      if ((time - ChatTime[playerid]) < 3)
      {
          SendClientMessage(playerid,-1,"You can send message only once in 3 secomds");
          return 0;
      }
      //if not then get the time they last used chat.
      ChatTime[playerid] = gettime();
      
      return 1;
  }