[Skimmer]

Try this and let me know if it works.

pawn Код:

new ScoreTimer[MAX_PLAYERS]; // Add this top of your script

public OnPlayerSpawn(playerid)
{
    ScoreTimer[playerid] = SetTimerEx("ScoreTimer", 180000, true, "i", playerid);
    return 1;
}

forward ScoreTimer(playerid);
public ScoreTimer(playerid)
{
    SetPlayerScore(playerid, GetPlayerScore(playerid) + 2);
    SendClientMessage(playerid, COLOR_LBLUE, "You have played for 3 minutes, you have earned +2 score!");
    return 1;
}

public OnPlayerDisconnect(playerid, reason)
{
    KillTimer(ScoreTimer[playerid]);
    return 1;
}