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private:

procedure CheckTimeOutHandler(sender:Tobject; var done:Boolean);

var lastEventTimestamp     : TDateTime;

procedure TForm1.CheckTimeOutHandler(sender:Tobject; var done:Boolean);
begin
  label60.caption := timetostr(now - lasteventtimestamp);
  if (now - lastEventTimestamp > 5*60*1000) then
  begin
    showmessage('Neuanmeldung ist fällig'); image1dblclick(self)
  end;
end;

procedure TForm1.FormCreate(Sender: TObject);        // Initialisierungen
begin
  windowstate := wsmaximized; home := getcurrentdir;
  BorderIcons := BorderIcons - [biSystemMenu];
  Forms.Application.OnIdle := CheckTimeoutHandler;
End;

procedure TForm1.FormMouseMove(Sender: TObject; Shift: TShiftState; X, Y: Integer);
begin
  lasteventTimestamp := now;
end;