hello,
If the NS record was changed, then there may be a delay with name servers waiting for refresh because the NS records are cached after a query is made. But, if the record is new and visible on the public name server that is authoritative over the domain, then the change should be visible right away to other name servers.
Registrar changes occur quickly and if the provider is running a public name server acting as a slave to a master server, there could be a delay for the transfer of changes for the zone.
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