All DNS records have a TTL (time to live) property that specifies the maximum amount of time the record may be cached.
In Linux you can make the DNS TTL lookup using the dig command.
You can both check the current domain remaining TTL as well as find out what TTL value is set on the name server where the domain is hosted on.
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Check Domain TTL
Check the remaining TTL value of a DNS record:
$ dig +noall +answer shellhacks.com shellhacks.com. 828 IN A 185.68.16.139
The remaining TTL value is 828 seconds.
Get the TTL value configured on NS:
$ DOMAIN=shellhacks.com; dig +noall +answer $DOMAIN @$(dig NS $DOMAIN +short|head -n1) shellhacks.com. 900 IN A 185.68.16.139
The configured TTL value is 900 seconds.