How to predict the cost of DNS when paying for requests (queries)?

Question

Domain Name System

The question is aimed at those who use paid DNS services (Amazon Route 53,dnsmadeeasy,...)
For example: We have 500,000 users daily, 1 domain 100 zones. TTL 24h
Approximately how long can they create monthly requests? (And what other parameters might it depend on?)

Answer 1

total queries = N*K*L*M
where
N - number of users
K - number of zones on all domains
l - cross-zone coefficient (from 0 to 1) - how many zones a user visits on average
M - coefficient of providers (from 0 to 1 ) - what part of the requests is hung by the providers' servers

Answer 2

if your users do not intersect in projects and there are 550,000 of them online every day, then they will generate a maximum of 550,000 thousand requests per day. Since some may have a common dns server provider, the real value will be less than 550,000, but the maximum should not be more.
Well, this value must be multiplied by 30 to get monthly requests.