unbound probleme nach dem Verreisen.

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I believe it to be 1000 seconds (~16 minutes):

$ man ntpd
[..]
       -g     Normally, ntpd exits with a message to the system  log
              if  the  offset  exceeds the panic threshold, which is
              1000 s by default.  This option allows the time to  be
              set  to  any  value without restriction; however, this
              can happen only once.  If the  threshold  is  exceeded
              after  that, ntpd will exit with a message to the sys-
              tem log.  This option can be used with the -q  and  -x
              options.

I recommend to factory default the Internet-->DNS4 & DNSv6 server settings and setup Fritzbox (FB) according to the official guide section "Pi-hole als DNS Server via DHCP an Clients verteilen (LAN Seite)":

That way the FB can sync time resolving via the ISP provided DNS servers independently from Pi-hole.
And you can configure the Pi with the FB IP using below NTP= directive (uncomment and enter FB IP):

$ sudo nano /etc/systemd/timesyncd.conf
[..]
#NTP=

FYI:

$ man timesyncd.conf
[..]
       NTP=
           A space-separated list of NTP server host names or IP
           addresses. During runtime this list is combined with any
           per-interface NTP servers acquired from systemd-
           networkd.service(8).  systemd-timesyncd will contact all
           configured system or per-interface servers in turn, until
           one responds. When the empty string is assigned, the list
           of NTP servers is reset, and all prior assignments will
           have no effect. This setting defaults to an empty list.

To apply above change:

sudo systemctl restart systemd-timesyncd.service

To check (wait a few seconds first to allow it to sync):

timedatectl

timedatectl timesync-status

Check below man page for reference:

man timedatectl

EDIT: Also see below:

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