Opening takes up to 1 hour. It also takes about 3-4 hours to update the information.
Some services, when adding a domain to themselves, may require confirmation of domain ownership by sending a letter to the mail specified in the domain's contact information. If the data in WHOIS is closed or not open, but not displayed, it will not be possible to verify domain ownership in this way. Alternative methods should be used for confirmation, for example using adding in domain settings TXTrecords (by analogy with Google Search Console). For information on the available methods, you need to check with the support of the service where the domain is added.
For .RU, .SU and .РФ domains, the availability of data in WHOIS depends on who is the domain administrator: