[Konstantinos]

No need timers for that! Use GetTickCount instead.

pawn Код:

new
    CountMilliseconds[ MAX_PLAYERS ]
;

public OnPlayerConnect(playerid)
{
    PlayerInfo[playerid][AdminMinute] = 0;
    CountMilliseconds[ playerid ] = GetTickCount( );
    return 1;
}

public OnPlayerDisconnect(playerid, reason)
{
    PlayerInfo[playerid][AdminMinute] = ((GetTickCount( ) - CountMilliseconds[ playerid ]) % (1000*60*60)) / (1000*60);
    return 1;
}