Please fill out the fields below so we can help you better. Note: you must provide your domain name to get help. Domain names for issued certificates are all made public in Certificate Transparency logs (e.g. crt.sh | example.com), so withholding your domain name here does not increase secrecy, but only makes it harder for us to provide help.
But the parent zone has a 48 hours (172800 seconds) TTL. This probably depends on your DNS provider or tld.
~$ dig @$(dig ns com. +short | head -n 1) athensplasticsurgerycenter.com ns
; <<>> DiG 9.18.0-2ubuntu2-Ubuntu <<>> @a.gtld-servers.net. athensplasticsurgerycenter.com ns
; (2 servers found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 38013
;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 2, ADDITIONAL: 3
;; WARNING: recursion requested but not available
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;athensplasticsurgerycenter.com. IN NS
;; AUTHORITY SECTION:
athensplasticsurgerycenter.com. 172800 IN NS ns01.one.com.
athensplasticsurgerycenter.com. 172800 IN NS ns02.one.com.
;; ADDITIONAL SECTION:
ns01.one.com. 172800 IN A 126.96.36.199
ns02.one.com. 172800 IN A 188.8.131.52
;; Query time: 50 msec
;; SERVER: 184.108.40.206#53(a.gtld-servers.net.) (UDP)
;; WHEN: Fri Feb 25 10:36:24 CET 2022
;; MSG SIZE rcvd: 133
If you want to modify your nameservers you have to modify them in both zones. And the parent one can be slow to update (for your clients, not for Let's Encrypt which always goes to the source)
Funnily enough, my dns provider (gandi livedns, a good service, but you can only have it if you buy your domain from them) goes the other way. If I ask the tld dns, my NS TTL is one hour, if I ask my authoritative nameservers, it's 4 hours.