new bool:CoolDown = false;

public OnMapStart()
{
    CreateTimer(15.0, CoolDown1, _, TIMER_FLAG_NO_MAPCHANGE);
}

public OnPluginStart()
{
    AddCommandListener(CommandListener);
}

public Action:CommandListener(client, const String:command[], args)
{
    if (StrEqual(command, "callvote", false))
    {
        new String:arg1[16];
        GetCmdArg(1, arg1, sizeof(arg1));
        if (StrEqual(arg1, "restartgame", false))
        {
            if(CoolDown == true)
            {
                CoolDown = false;
                CreateTimer(15.0, CoolDown2, _, TIMER_REPEAT|TIMER_FLAG_NO_MAPCHANGE);
                return Plugin_Continue;
            }
            else
            {
                CreateTimer(15.0, CoolDown3, _, TIMER_REPEAT|TIMER_FLAG_NO_MAPCHANGE);
                PrintToChatAll("Идёт кулдаун")
                return Plugin_Handled;
            }
        }
    }
    return Plugin_Continue;
}

public Action CoolDown1(Handle timer)
{
    CoolDown = true;
}

public Action CoolDown2(Handle timer)
{
    CoolDown = true;
}
public Action CoolDown3(Handle timer)
{
    CoolDown = true;
}