How can I cancel the WLan and time query after about 30 seconds without getting a connection?

[Wolli01]

How can I cancel the WLan and time query after about 30 seconds without getting a connection? (Restart)
And how can you query the times that you automatically get summer or winter time.
Can anyone help me?
Here's my code that usually works very well.

    # W-Lan Verbindungsaufbau---------------------------------------------
    if (Verbindung) == 1:
        from network import WLAN
        wlan = WLAN(mode=WLAN.STA)
        nets = wlan.scan()

        for net in nets: #Suche nach W-Lan Netzen
            Routerwahl = 1 #Der Router aus den Settings
            print(net.ssid) #Gefundene Netzwerke
            time.sleep(0.5)

            if net.ssid == 'XXXXX': #Immer Zugang
                Routerwahl = 2
                time.sleep(0.5)

            if net.ssid == settings.Router or net.ssid == 'XXXXX': #Auswahl von 2 Zugängen
                print('Netzwerk gefunden!')
                print('Verbinde mit... ' + net.ssid)

                if (ssd1306) == 1:
                    if (settings.Display) == 1:
                        x = OledDisplay.OledDisplay(True)
                        xo = OledGrafx.OledGrafx(True)
                        x.clear()
                        xo = OledGrafx.OledGrafx(True)
                        xo.PrintStrings("W-Lan Netz...","wurde gefunden","Verbindung wird","aufgebaut...")
                        time.sleep(1)

                if Routerwahl == 1: #Der Router aus den Settings
                    wlan.connect(net.ssid, auth=(net.sec, settings.Pass), timeout=5000)
                    while not wlan.isconnected():
                        machine.idle() # save power while waiting
                    print('WLAN-Verbindung erfolgreich!')

                    if (ssd1306) == 1:
                        if (settings.Display) == 1:
                            x.clear()
                            xo = OledGrafx.OledGrafx(True)
                            xo.PrintStrings(""," Verbindung...","   O K","")
                            time.sleep(1)

                if Routerwahl == 2: #Immer Zugang
                    wlan.connect(net.ssid, auth=(net.sec, 'XXXXX'), timeout=5000)
                    while not wlan.isconnected():
                        machine.idle() # save power while waiting
                    print('WLAN-Verbindung erfolgreich!')

                    if (ssd1306) == 1:
                        if (settings.Display) == 1:
                            x.clear()
                            xo = OledGrafx.OledGrafx(True)
                            xo.PrintStrings(""," Verbindung...","   O K","")
                            time.sleep(1)
# Datum und Uhrzeit vom Server holen------------------------------------------------------------------------------------

                print("Syncing RTC to NTP...")
                if (ssd1306) == 1:
                    if (settings.Display) == 1:
                        x.clear()
                        xo = OledGrafx.OledGrafx(True)
                        xo.PrintStrings("Datum und","Uhrzeit...","wird vom","Server geholt")
                        time.sleep(1)

                rtc.ntp_sync("pool.ntp.org", update_period=3600) # Datum und Uhrzeit holen
                #rtc.ntp_sync("pool.ntp.org")

                while not rtc.synced():
                    machine.idle() # save power while waiting

                # Startzeit
                #print(rtc.now())
                time1 = rtc.now() # Übergabe Datum und Uhrzeit in die Variable time1
                startzeit = time.time()
                LogDateTime = "{}.{:}.{:};{:0>2d}:{:0>2d}:{:0>2d}".format(time1[2], time1[1], time1[0], time1[3]+TimeDiff, time1[4], time1[5])
                LogDate = "{}.{:}.{:}".format(time1[2], time1[1], time1[0])
                LogTime = "{:0>2d}:{:0>2d}:{:0>2d}".format(time1[3]+TimeDiff, time1[4], time1[5])
                print (LogDateTime)
                break
# Datum und Uhrzeit vom Server holen------------------------------------------------------------------------------------