@jfb
my original intention for this was to change it because i use pihole as a normal dns server, not as an adblocker.
i tried to create an own config file /etc/dnsmasq.d/50-lug.conf
in there i've put local-ttl=86400
but then dnsmasq won't start anymore
changing this in the 01-pihole.conf works, but it's gone after updating pihole