Who has experience using Yandex NS servers (mail for domain)?

Question

Domain Name System

Good afternoon!
1. Interested in the speed of updating data when using NS Yandex? For example, I made changes to A record. How quickly will the changes take effect? Or here everything, like everywhere else, depends solely on the zone (ru, com, org, etc.)
All provided that the domain is delegated to Yandex.
2. dns1.yandex.net. is this a NS server?

Answer 1

1. Depends on a number of factors, and Yandex has nothing to do with it (google about TTL records, about negative caching). In some cases, this happens almost instantly.
2. Yes.