[Micko123]

PHP код:

new LoginTimer[MAX_PLAYERS];
#define SECONDS_LOGIN    60
public OnPlayerConnect(playerid)
{
    LoginTimer[playerid] = SetTimerEx("OnLogin", SECONDS_LOGIN * 1000, false, "d", playerid);
    return 1;
}
public OnPlayerDisconnect(playerid, reason)
{
    LoginTimer[playerid] = 0;
    return 1;
}
forward OnLogin(playerid);
public OnLogin(playerid)
{
    LoginTimer[playerid] = 0;
    ShowPlayerDialog(playerid, DIALOG_UNUSED, DIALOG_STYLE_MSGBOX, "Login", "You have been kicked for taking too long to login to your account", "Okay", "");
    Kick(playerid);
    return 1;
}
public OnPlayerSpawn(playerid)
{
    KillTimer(LoginTimer[playerid]); //this you can put when player succes on login but i've put it under OnPlayerSpawn because I don't know your login sys
    return 1;
} 


Here you go
EDIT: You can change time by changing this

PHP код:

#define SECONDS_LOGIN    60