[Chyakka]

You could create a new variable in the player info enum for kick time and utilize

Code:

Info[id][newkickvariable] = gettime()+240; //4 minutes

when you kick them, save it to a database and when they attempt to connect.

Code:

public OnPlayerConnect(playerid) {
    if(Info[id][newkickvariable] > gettime())
    {
        //send message and kick them
        DelayKick(playerid);
    }
}

Although you'd probably want to change it to run that last bit of logic after it loads all the player data from the database otherwise it won't work.