[Logic_]

20 seconds? Isn't it too less? Show us your OnPlayerConnect callback.

EDIT: I made an example for you, this will work too.

PHP код:

new cT[MAX_PLAYERS];
public OnPlayerConnect(playerid)
{
    cT[playerid] = SetTimerEx("Connection", 60000, false, "i", playerid);
    return 1;
}
forward Connection(playerid);
public Connection(playerid)
{
    // Kick Player...
    KillTimer(cT[playerid]);
    return 1;
}