// Unix timestamp

forward Update();

public OnGameModeInit()
{
    SetTimer("Update", 2000, true);
    return 1;
}

public OnPlayerConnect(playerid)
{
    SetPVarInt(playerid, "Kick", gettime()+30);
    return 1;
}

public Update()
{
    for(new i = 0; i < MAX_PLAYERS; i++)
    {
        if(GetPVarInt(i, "Kick") <= gettime() && GetPVarInt(i, "Kick") != 0)
        {
            SetPVarInt(i, "Kick", 0);
            Kick(i);
        }
    }
    return 1;
}

public OnDialogResponse(dialogid)
{
    if(dialogid == DIALOG_LOGIN)
    {
        // If managed to login successfully.
        SetPVarInt(playerid, "Kick", 0);
    }
}

// ======================================= Another example of anti spam

OnPlayerText(playerid, text[])
{
    if(GetPVarInt(playerid, "CantTalk") < gettime())
    {
        SendClientMessage(playerid, -1, "Don't spam");
        return 0;
    }
    SetPVarInt(playerid, "CantTalk", gettime()+2);
    return 1;
}