[[DOG]irinel1996]

As you see TotalGameTime returns PlayerInfo[ playerid ][ TotalTime ], you should save that one and order players by its value.

pawn Код:

public OnPlayerDisconnect(playerid, reason) {
    new query[128], name[MAX_PLAYER_NAME];
    GetPlayerName(playerid, name, MAX_PLAYER_NAME);
    format(query,128,"UPDATE Accounts SET totaltime = %d WHERE nickname = '%s'",TotalGameTime(playerid),name);
    mysql_query(query);
    return 1;
}

As you see I used totaltime, a simple integer.
Then for the Top.

pawn Код:

mysql_query("SELECT nickname FROM accounts ORDER BY totaltime LIMIT 5");

LIMIT 5 is the max rows will be returned, I mean, 5 players.